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Re: slant 6, fuel mileage. what should i get?
[Re: DaytonaTurbo]
#54897
03/15/08 03:41 PM
03/15/08 03:41 PM
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Joined: Mar 2006
Posts: 1,611
Pataskala, Ohio
GTX70sixpack
top fuel
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top fuel
Joined: Mar 2006
Posts: 1,611
Pataskala, Ohio
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I had a 67 Dart GT vert and a Spirit of 76 Dart that I drove for several years back in the 80's. They both got 16mpg. I had a 318 Charger and a 318 Coronet, the Charger got 18mpg and the Coronet 21mpg. My son,s 66 Dart SW when it had a 318 got 22mpg. These are all highway miles. In perspective if I drive my GTX nice, it gets 16.5 with the 440-6. Although normally I'm at 14 on it. My V6 Dakota gets 20mpg and my polyspere 318 65 9 pass wagon gets 19.
65 Belvedere II Station Wagon
69 Coronet R/T convertible
70 GTX
70'cuda
99 Dodge Diesel dually 4X4
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Re: slant 6, fuel mileage. what should i get?
[Re: DaytonaTurbo]
#54898
03/15/08 03:41 PM
03/15/08 03:41 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Hmm, are those Imperial gallons he's getting 21 mpg with that Diplomat? Cause if so then it works out to about 16 mpg using US gallons.
I had a 72 Swinger with a 225, 2.45 gears, and it was lucky to pull 10 mpg on it in mixed driving. But I attribute that to the 2.45 gears. Swapped in an 8 1/4 to replace the 7 1/4 and never thought to see what gears it had. That was a big mistake.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54899
03/15/08 03:50 PM
03/15/08 03:50 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Depends on much more than the cubic inches or cyls. I have a 68 cuda with a 318 that gets 29 highway and 19 city. The slant could do better if properly built and set up similarly. Why would anyone drive a slant car if you were only getting 16mpg 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54900
03/15/08 04:39 PM
03/15/08 04:39 PM
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Joined: Jan 2003
Posts: 2,511
Tampa , Fl
MoparJoe
super gas
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super gas
Joined: Jan 2003
Posts: 2,511
Tampa , Fl
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I was getting 15mpg out of my Duster when it had a 225 /6 1 barrel/904/2.76 7 1/4, most of my driving was hwy 65-70mph.
It was all stock and was in good shape, motor was in tune and had a carter 1 barrel- It was my driver for about 2 years like that.
When I swapped in a mild 318/998 I was getting 20-21mpg with the same rear & driving conditions.
The 318 had about 9.3 comp, 268 comp cam, 360 heads, M1, 600 eddy carb, headers & 2 1/2" duals w/turbo muffs.
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54903
03/15/08 06:40 PM
03/15/08 06:40 PM
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Joined: Nov 2006
Posts: 203
Taneytown, MD
bigslant6fan
enthusiast
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enthusiast
Joined: Nov 2006
Posts: 203
Taneytown, MD
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I,m getting 24 MPG in a 3,400 lb S/6 a-body with a 470 lift cam,3.23 gears,and a turbo. If your not getting at least 25 MPG out of a S/6 a-body car,something is bigtime wrong.Check for missconected dist. advance line,blown advance cannister(very common with S/6 engines leaking oil on pass side of engine),flooding carb,stuck advance weights.I bought a S/6 79 volare and discovered the advance weights were stuck.I ran into the prevous owner 6 month latter and he said he sold the car because of a lack of power,and poor fuel economy.He s#@t a brick when I told him I was getting 23MPG. Also, the first thing I,d check is those gears,you say its "screeming along at high way speeds"2.76 or 2.94 are what most cars came with. 
Last edited by bigslant6fan; 03/16/08 09:34 AM.
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54904
03/15/08 07:59 PM
03/15/08 07:59 PM
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Joined: Aug 2007
Posts: 469
New York, USA
fluegelmeister
mopar
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mopar
Joined: Aug 2007
Posts: 469
New York, USA
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Quote:
I have a slant 6 dart automatic and its only getting around 16 mpg , mostly interstate driving some on the back roads. is this average? would a 4 speed overdirve help verymuch? it is winding pretty tight on the interstate but i am not sure of what the gears are in it. and i dont have a tach in it either but it screams right along.
just looking to get some better mileage. i got 16 mpg with my 318 cuda!
Try tuning it up:
1. Adjust the valves
2. Adjust points or better yet, replace points with transistorized ignition
3. Check timing
4. new plugs & wires
5. Check heat valve isn't stuck
6. If equipped, check the EGR
7. rebuild the carb and adjust the floats to spec. Tank the cast parts if possible.
8. Check PCV
I think it should get 19-21. That's what I used to get with my valiant.
Good luck,
Barry
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Re: slant 6, fuel mileage. what should i get?
[Re: fluegelmeister]
#54905
03/15/08 10:55 PM
03/15/08 10:55 PM
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Joined: Jan 2003
Posts: 9,887
USA
CrAlt
master
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master
Joined: Jan 2003
Posts: 9,887
USA
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My 225/904/2.76's 4dr abody gets about 20-22mpg. It runs like crap because ive never tuned it and i think has a small vacuum leak or a dead cyl at idle.
I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.
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Re: slant 6, fuel mileage. what should i get?
[Re: CrAlt]
#54906
03/16/08 01:26 AM
03/16/08 01:26 AM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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Dad had a 74 \6 Duster and I had a 70 \6 duster, as well as a 65 \6 Valiant, but the Valiant was a 3 speed manual. Got 29 with the Valiant at 17 years old. Got 28 with the 70 and dad consistently got 30 with his 74. That's to an Imperial gallon. That would convert to 23-25 for a US gallon.
2 Demons...no, not my kids! 
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54907
03/16/08 09:07 AM
03/16/08 09:07 AM
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Joined: Feb 2003
Posts: 8,020
Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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My '84 D100 gets 20mpg at 65mph. 225, 833od, 3.91sg, 235x15 tire
My '68 V200 gets 25mpg at 65mph. 225, 904, 2.94peg, 185x13 tire
My sister bought a loaded '80 Mirada new, even had the am/fm/cb/cassette radio, 225, 904, 2.45, 215x14 tire, it got 23mpg at 70mph.
There's something wrong with a slant six A body that gets less than 20mpg/hwy.
Last edited by V code '70 Bee; 03/16/08 09:09 AM.
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Re: slant 6, fuel mileage. what should i get?
[Re: slantzilla]
#54909
03/16/08 10:50 AM
03/16/08 10:50 AM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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do you have a stick or auto' either way there are overdrive options for both, the stick would be easier. also rear gears and tire size will make a world of difference. I have had many leaning towers and they were very tough, but not necessarily mileage conscious. How ever they are easily modified for both mileage and power.It really depends on the whole combo. Start with the tallest tire you can fit. Look for tall rears gears, should be able get a complete rear cheap to slip under it. do you know how to check your gears? Remember any of these changes will affect your speedometer.
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54913
03/17/08 08:25 AM
03/17/08 08:25 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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my duster gets about 25mpg combined with a all stock slant6 1bbl, A833OD, and a 3.21 rear with 25" tall tires. beating on it in town I've never gotten worse than 18-19. best highway mileage I've gotten was 32mpg sticking to a constant 60mph.
that's in an all stock '76 A body, I'm guessing the car is 3200-3300 lbs.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: slant 6, fuel mileage. what should i get?
[Re: FarDarter]
#54914
03/17/08 03:53 PM
03/17/08 03:53 PM
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Joined: Oct 2003
Posts: 411
Texas
vynn3
mopar
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mopar
Joined: Oct 2003
Posts: 411
Texas
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Quote:
Slant sixes don't get good enough mileage to justify their existence. I did a five tank log on my Dart and the best was 21.29 while the worst was 17.40. The average was 19.13. In my opinion, that isn't good enough to live with the total lack of power.
I had an '84 Celica GT-S that got about 29 on a cross country trip at about 75 mph with the AC on full blast and it was faster than my Dart, too. I've gotta have either better mileage or more power than the Toyota with my Mopar. That's why I'm putting a 318 in it. With a small cam and an A-500, I'm betting it will do better than the /6.
And what condition is your slant in? How many miles? Sure, a new or freshened 318 can get better mileage than a tired old slant, but the same overdrive and a rebuilt slant with a few cheap, basic mods like a Super Six 2bbl and good exhaust will get mileage in the 20-25 mpg range.
If the car is a weekend toy, then sure, why not drop in a V-8. Heck, why stop there? Go big block.
But if you're using a car for a daily driver, with gas prices rising AGAIN, then 2-4 mpg makes a big difference to MY wallet.
I realize this is a hot rodder forum, but I don't like my job well enough to need more than 200hp to get there. I drive my toys on the weekend.
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Re: slant 6, fuel mileage. what should i get?
[Re: vynn3]
#54916
03/17/08 08:52 PM
03/17/08 08:52 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Quote:
Quote:
Slant sixes don't get good enough mileage to justify their existence. I did a five tank log on my Dart and the best was 21.29 while the worst was 17.40. The average was 19.13. In my opinion, that isn't good enough to live with the total lack of power.
I had an '84 Celica GT-S that got about 29 on a cross country trip at about 75 mph with the AC on full blast and it was faster than my Dart, too. I've gotta have either better mileage or more power than the Toyota with my Mopar. That's why I'm putting a 318 in it. With a small cam and an A-500, I'm betting it will do better than the /6.
And what condition is your slant in? How many miles? Sure, a new or freshened 318 can get better mileage than a tired old slant, but the same overdrive and a rebuilt slant with a few cheap, basic mods like a Super Six 2bbl and good exhaust will get mileage in the 20-25 mpg range.
If the car is a weekend toy, then sure, why not drop in a V-8. Heck, why stop there? Go big block.
But if you're using a car for a daily driver, with gas prices rising AGAIN, then 2-4 mpg makes a big difference to MY wallet.
I realize this is a hot rodder forum, but I don't like my job well enough to need more than 200hp to get there. I drive my toys on the weekend.
I don't mind only haveing 200 hp to get to work, gettin off work is a different story though 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: slant 6, fuel mileage. what should i get?
[Re: FarDarter]
#54917
03/17/08 08:53 PM
03/17/08 08:53 PM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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Geez...early 70's 225 single barrels were 145bhp. Headers and some creative cam and headwork, and 200 really isn't out of line. Let alone looking at a fairly easy turbo swap which should offer considerably more. Let's not even mention that Hyper-pak engines were already pretty much there, at 195.
I don't know why everyone's always dumping on the slant. It's a decent (or should be) economy engine with a LONGSTANDING history for longevity that is hard pressed to be matched by ANY production passenger vehicle engine.
2 Demons...no, not my kids!
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Re: slant 6, fuel mileage. what should i get?
[Re: FarDarter]
#54919
03/17/08 10:20 PM
03/17/08 10:20 PM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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Now THAT I agree with, but after making the ugly payments on a new car, and dealing with dealerships and shops for everything because the things are too freaking cramped (or under warranty) to work on, I gotta say...a late 60's-mid 70's A-body with a slant (or 318, as hotroddave40 has proven) that'll knock down better mileage than my current daily drivers, (or past, considering the last 5 years) gets awfully appealing when there's not a thing that requires me to seek outside service, and NO PAYMENT! 
2 Demons...no, not my kids!
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Re: slant 6, fuel mileage. what should i get?
[Re: mr.318]
#54922
03/18/08 09:01 AM
03/18/08 09:01 AM
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Joined: Aug 2006
Posts: 1,349
warfordsburg, PA
dirt
OP
pro stock
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OP
pro stock
Joined: Aug 2006
Posts: 1,349
warfordsburg, PA
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some one mentioned a turbo. i used to run a shelby Z daytona with turbo it got 31 MPG on the interstate and was fun to drive....until i wraped it around a tree when i was 19. but i still have the car and thought it would be cool to put the turbo or another turbo on my slant 6 dart. I know the /6 is strong and at least when its stock its indestructible! how complicated would it be to put a turbo on one? i know how it works and i know i could fabricate everything to hook it up but what about over boosting or selecting the right turbo? I would like to keep it cheap , like junk yard stuff. would you just plumb in the turbo from a daytona and see what happens? would the compression in a /6 be low enough to work? how many punnds boost would be safe with a stocker? i am just thinking out loud here, thanks for any advice, the blue one is my $400 beater /6 the other one is my 70 340 that i restored 15 years ago. 
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Re: slant 6, fuel mileage. what should i get?
[Re: FarDarter]
#54923
03/18/08 09:05 AM
03/18/08 09:05 AM
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Joined: Oct 2003
Posts: 411
Texas
vynn3
mopar
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mopar
Joined: Oct 2003
Posts: 411
Texas
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Quote:
I think most of us here are the kind of guys who can enjoy just standing behind our cars and listening to the rumble of the dual exhaust. To watch the car sink a little bit on the right when we stab the gas in neutral. To feel the vibrations of the engine through the whole car.
My mildly-modified slant has true duals (and a nice rumble), the torque rotates the engine nicely in neutral, and makes plenty of nice vibrations through the car. On top of that, it makes a roar on the highway akin to a WWII fighter plane, rather than the V-8 noises that come from every Tom, Dick and Harry's Camaro, Mustang, or pick-up.
Sure, apples to apples, with the same mods a V-8 will always make more power. But my slant responds well to modifications (sometimes better than a V-8 — the 2bbl and Dutra Dual exhaust made a night and day difference in power, and got BETTER mileage!), it's easy to work on, and gets a different kind of interest when I pop the hood. Finding slant parts is more challenging than finding V-8 parts, but the same applies to finding Mopar small block parts compared to Chebbie parts. For example, my "long rod" slant has longer 198 rods and 2.2 4-banger pistons, giving it the same displacement but a better rod ratio and lighter pistons. Slanters like Doug Dutra have to get "creative" to make up for the lack of hot parts. I LIKE that challenge. But, to each his own.
I'm not knocking V-8's, I've owned plenty over the years, and I have a wonderful little V-8 Dart GT now. I love 'em for what they are and what they can do. But my slant is UNIQUE, and uniqueness is what lured me to Mopars and away from Fords and Chebbies in the first place.
I happen to think there's room enough for hot slants, small blocks, AND big blocks in the Mopar world (not to mention V-6's and inline 4's) without knocking the other engines. They can ALL be fun and cool in their own way.
(But yes, Dave, there's not an engine out there that will get me HOME from work fast enough. )
vm
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Re: slant 6, fuel mileage. what should i get?
[Re: vynn3]
#54924
03/18/08 09:46 AM
03/18/08 09:46 AM
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Joined: Jan 2008
Posts: 299
East Brunswick, NJ
finadk
enthusiast
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enthusiast
Joined: Jan 2008
Posts: 299
East Brunswick, NJ
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Up until a few months ago felt that a /6 was only good as a boat anchor. Once gas hit $3 a gallon I started to research the slanty six a bit and elected to go with an 80 Volare /6 over a 318 Duster for my Son's first car. Sure a 318 can get good milage with careful driving but the /6 has does respond well to traditional hot rod upgrades and is as reliable an ax. Checl our slantsix.org for all you will ever need to know.
The "Super Six" 2 barrels get better milage than the one barrel. My car is not on the road yet so I cant speak to gas milage but I have had many 318's and never saw more than 12 mpg with any of them, not that it cant be done but I live in the north east and there is just a lot of stop and go, even on the highways.
the car we found was an automatic but with a stick even a 90hp 1bbl would be fun to drive.
Scott
1956 Dodge Custom Royal Lancer (408 Stroker, 4 Wheel Disc Brakes, Rack & Pinion, 6 speed)
2002 Dodge Ram 1500 Quad Cab
1976 Corvette
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Re: slant 6, fuel mileage. what should i get?
[Re: dirt]
#54925
03/18/08 02:44 PM
03/18/08 02:44 PM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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Quote:
some one mentioned a turbo. i used to run a shelby Z daytona with turbo it got 31 MPG on the interstate and was fun to drive....until i wraped it around a tree when i was 19. but i still have the car and thought it would be cool to put the turbo or another turbo on my slant 6 dart.
I know the /6 is strong and at least when its stock its indestructible! how complicated would it be to put a turbo on one? i know how it works and i know i could fabricate everything to hook it up but what about over boosting or selecting the right turbo? I would like to keep it cheap , like junk yard stuff. would you just plumb in the turbo from a daytona and see what happens? would the compression in a /6 be low enough to work? how many punnds boost would be safe with a stocker?
i am just thinking out loud here, thanks for any advice, the blue one
is my $400 beater /6 the other one is my 70 340 that i restored 15 years ago.
Turbo from a 3.8L GM is perfect for this, as displacement is almost identical... Turbo Regal, etc...and I happen to have one...
2 Demons...no, not my kids!
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Re: slant 6, fuel mileage. what should i get?
[Re: fluegelmeister]
#54927
03/30/09 07:00 PM
03/30/09 07:00 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I own a 72 dart swinger with a 225 slant 6 in it. and my fuel mileage is anywhere from 7 yes 7 to 13 mpg. The thing is driving me a little nuts since it is my daily driver. I bought and installed new spark plugs, spark plug wires, it has the stock electrical ignition, an accel coil. the gears are 2.79 if I remember right and is an 3 speed automatic. the car only has about 160,000 miles on it too and from what I hear and read that is about the half way point on these cars. I also had the timing redo by a mechanic and he set it to 5 twice the amount of what the stock is of 2.5 so I am not too sure if that helps any. I am still new to the car world and am learning a lot on the way to fixing my dart up.
When I bought it the previous owner already installed a two barrel carburetor, I am not too sure of which it is I will have to check and post later.
But I am seriously hoping I can do much better than 13 mpg so if you guys can give me any further detail it would be much appreciated.
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Re: slant 6, fuel mileage. what should i get?
[Re: mark7171]
#54930
03/30/09 08:58 PM
03/30/09 08:58 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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my bone stock '76 with a 225 1bbl, A833OD, 3.21 gears and 25" tall tires knocks down 19-22mpg city, 25-28mpg highway with a best of 32. a lot of people actually report marginally BETTER mileage after retrofitting the super 6 2bbl setup...
your combo I'd expect about 18-20 city and 22-24 highway.
I'd look at maybe a carb rebuild.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: slant 6, fuel mileage. what should i get?
[Re: patrick]
#54932
03/30/09 10:44 PM
03/30/09 10:44 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
my bone stock '76 with a 225 1bbl, A833OD, 3.21 gears and 25" tall tires knocks down 19-22mpg city, 25-28mpg highway with a best of 32. a lot of people actually report marginally BETTER mileage after retrofitting the super 6 2bbl setup...
your combo I'd expect about 18-20 city and 22-24 highway.
I'd look at maybe a carb rebuild.
So I found out what my fuel problem was as I went to go look at what type of carburetor I have. And the verdict was having a huge wad of a paper towel shoved in my air blower.... my carburetor was sucking for air and couldn't get any... I can already tell the difference of how much less I have to push the pedal to go at freeway speeds.
And answering someone who asked about how much boost a slant 6 can take. from all the research I have done, since it has an 8:4:1 compression ratio it has been able to take 24-26 pounds of boost max which is a hell of a lot. I don't know if some one's engine survived after that but that is what I read if you are planning on turboing your slant 6.
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Re: slant 6, fuel mileage. what should i get?
[Re: elmor]
#54935
03/30/09 11:59 PM
03/30/09 11:59 PM
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Joined: Apr 2007
Posts: 1,261
ILL
mark7171
pro stock
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pro stock
Joined: Apr 2007
Posts: 1,261
ILL
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Quote:
There is a local guy that runs a 225 in 65 Valiant wagon. He's running with the big blocks at the local strip. Knocks down mid to low 12's consistently. They will run hard with some TLC!
that is almost impossible.
9+ to 1 compression I6. 4.88 gear. mechanical cam MP4286681. race everything. Abody stripped to less than 2750 lbs. 4 speed. no rear brake contact. no front bearing drag. suspension set for drag only.
You get....high 14's
....and no mileage worth typing. Save your money.
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Re: slant 6, fuel mileage. what should i get?
[Re: mark7171]
#54936
03/31/09 01:27 AM
03/31/09 01:27 AM
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Joined: Jan 2009
Posts: 189
Plano, Texas
Dallasdart
member
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member
Joined: Jan 2009
Posts: 189
Plano, Texas
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it's been a while since I have been in the slant forum but I know there are several A body guys running 12's. It's possible, just very $$. I had a 66 dart with a slant and a 3 on the tree. Loved that car and after I rebuilt the tired motor it was a strong car.
72 Dart Swinger 360 Project
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Re: slant 6, fuel mileage. what should i get?
[Re: mark7171]
#54937
03/31/09 08:57 AM
03/31/09 08:57 AM
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Joined: Oct 2003
Posts: 411
Texas
vynn3
mopar
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mopar
Joined: Oct 2003
Posts: 411
Texas
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Re: slant 6, fuel mileage. what should i get?
[Re: dulcich]
#54938
03/31/09 09:21 AM
03/31/09 09:21 AM
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Joined: Jan 2008
Posts: 2,225
ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,225
ILLINOIS
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Quote:
Stock slant gets about 18 mpg average if everything is right. Very inefficient motor.
-dulcich
  go tell the rest of the guys how "inefficient" the /6 is over on the /6.org board and be ready for a flame war! I've had efficient ones and inefficient ones just like I have with V8s. My Dad had an 82 Gran Fury in which I had PLENTY of seat time in that got 28 MPG over the road (NO I am NOT dreaming) /6. Ive seen lotsa "modern" V-6s with all their computer BS and injection that can't do that!!!
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Re: slant 6, fuel mileage. what should i get?
[Re: B5 Bee]
#54939
03/31/09 10:31 PM
03/31/09 10:31 PM
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Joined: Jan 2003
Posts: 5,789
Hamilton, Ontario Canada
Magnum
master
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master
Joined: Jan 2003
Posts: 5,789
Hamilton, Ontario Canada
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Quote:
My '68 V200 gets 25mpg at 65mph. 225, 904, 2.94peg, 185x13 tire
What is a V200?
Quote:
I have a 225 in a 74 Duster automatic with 2.7 gears and it gets 20-25 which is about the same as my 94 Chysler New Yorker with the 3.5.
Mitch
Have similar cars. 225 in a 65 Belvedere and a 94 LHS. Nice thing about the 65 is even if you city drive it and drive it hard it's still gets 20 mpg. Mid 20s are average for highway and our best tank is a straight Full to Empty at 70 mph, was 26 mpg. Odometer was confirmed against GPS.
As for comparing it to the LH with a similar size engine. Our mileage is also around the same numbers. I've seen the mileage in the teens when city driving the LHS but have also seen 29 straight highway. The biggest difference is the performance. 65 ran a 19.9, the LHS is 15.8 in the 1/4.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: slant 6, fuel mileage. what should i get?
[Re: patrick]
#54940
03/31/09 10:37 PM
03/31/09 10:37 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
my bone stock '76 with a 225 1bbl, A833OD, 3.21 gears and 25" tall tires knocks down 19-22mpg city, 25-28mpg highway with a best of 32. a lot of people actually report marginally BETTER mileage after retrofitting the super 6 2bbl setup...
Better MPG than 32 ? .... roger that.
Anyone remember a biz called SVI ? ... they did muchO bester !
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Re: slant 6, fuel mileage. what should i get?
[Re: dOc !]
#54941
03/31/09 10:58 PM
03/31/09 10:58 PM
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Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
moparmarks
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
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Fact: The 1976 Feather Duster and Dart Sport Light with the 255/883OD were the first US cars to get over 31mpg.
My 75 Dart Sport with an auto got 27-28 highway all day long. My 79 B200 w/ 318 883OD and 355 gears got 25 highway.
If your getting under 20 in an A-body then something is wrong.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: slant 6, fuel mileage. what should i get?
[Re: moparmarks]
#54942
04/01/09 12:00 AM
04/01/09 12:00 AM
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Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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The best I ever did was 29.5 with my 72 Duster. 1bbl 198 long rod short stroke with 3:23's and a 3 speed manual. Usually got 25.4 highway. This is running pump 93. I added a Holley 2bbl from a 318 headers, .090 off the head, lots of porting, really tight lash. It dropped to 22mpg. I swear the 2:74's or 2:76's lug the slant and suck the gas. Dad had a 73 Valiant 4 door that got 13. Slush box PS and air. I was getting about 16 with my 74 auto 2:76 PS 4 door Dart. I reset the lash tighter than stock, tuned it and got 18+ before it sucked a rag into theoil pick up  I have a post with pics running right now. 
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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If you've got the time, this is a VERY informative read.He's done his homework, and has got the numbers to back it up! 
