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426 hemi mpg what are you getting in yours
Posted By: maxie
426 hemi mpg what are you getting in yours - 10/15/06 03:30 PM
I have just under 225 miles on the car so far. I didnt build it for fuel economy, but I thought it would be better than what it is. I am getting between 7-8 mpg out of the car so far. How you others doing with yours.
my set up is
426 siamese block
10.25 to 1 j and e piston
manely rods
eagle crank
426-2 indy intake
850 mighty demon
comp cams 508/519 235 at 50 mechanical cam
msd
2 1/8 hooker super comps
3 inch flowmaster exhaust
bowl and pocket work on the mopar aluminum heads
dana 60 with 3.54
4 speed
29.5x15.5x15 rear tire
2850-3000 rpm's at 70 mph
car weighs in at 3640 with a 1/2 tank
What do you think and how are yours doing. This is still a lot better than my max wedge was doing.
Posted By: topside
Re: 426 hemi mpg what are you getting in yours - 10/15/06 03:48 PM
I don't think mine's ever done better than that, but in 20 years I've never really checked it; I just make sure there's gas available every 100 miles if it's going that far.
Mine's 438", 2x4 inline original carbs, 10.8:1, 260* @ .050, .565/.547 lift, 4-speed, 4.10, 27.5" tire, 3800 lbs, see Attachment. I generally keep it around 3000-3500 RPM but I have a rule that every time out, it sees full throttle at some point.
Posted By: stumpy
Re: 426 hemi mpg what are you getting in yours - 10/15/06 04:05 PM
If you have to ask then you need to swap it for a leaning tower of power.
That sounds like a normal milage figure for that engine.
Posted By: maxie
Re: 426 hemi mpg what are you getting in yours - 10/15/06 04:06 PM
we have twins.
Posted By: Hemi_Jack
Re: 426 hemi mpg what are you getting in yours - 10/15/06 04:19 PM
The best I've ever done with mine is 11.65 mpg cruising at 55-60. It usually gets about 9.6 on the highway. It depends on how many of the carbs I use! It is 10.5:1 has a torqueflite and 4.10 gears.
Posted By: RUNCHARGER
Re: 426 hemi mpg what are you getting in yours - 10/15/06 06:40 PM
7 or 8 around town and getting on it once in awhile is about right. With 3.54 or 3.23 gears I generally get 13-14 MPG on the highway with them.
Sheldon
Posted By: AlexP
Re: 426 hemi mpg what are you getting in yours - 10/15/06 10:24 PM
That really isn't as bad considering that I rarely get more than 12 mpg around town in my 4.6 thunderbird.
Posted By: HemiChallenger
Re: 426 hemi mpg what are you getting in yours - 10/16/06 12:08 AM
about 7 give or take on the speed/rpm's.
Posted By: PAINT IT BLACK
Re: 426 hemi mpg what are you getting in yours - 10/16/06 12:21 AM
That's not that bad really. I estimate I only get about 9 or 10mpg with my small block.
Posted By: 472 R/T SE
Re: 426 hemi mpg what are you getting in yours - 10/16/06 12:28 AM
OUt on the highway with an occasional romp I'm getting low 13's runnin' @ 3000-3200 rpm's.
I haven't checked around town yet.
Posted By: sthemi
Re: 426 hemi mpg what are you getting in yours - 10/16/06 04:46 AM
Back in 84 I Drove my 71 RT Hemi Charger 4speed 3:54 Dana from Chicago burbs to the Holiday INN at Indy, about 230 miles.. one tank of gas..
factory carbs, a little bigger cam..
Got to drive around the INdy 500 track that year...
Posted By: michaelphbarnett
Re: 426 hemi mpg what are you getting in yours - 10/16/06 06:09 AM
Wait, shouldn't it be GPM?
Posted By: quickd100
Re: 426 hemi mpg what are you getting in yours - 10/16/06 11:27 AM
You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me.
Dave
Posted By: MLR426
Re: 426 hemi mpg what are you getting in yours - 10/16/06 12:23 PM
I get alittle over 10 miles to the gallon
with crossram 770's, 410 gear, 31.5 tires,and
565 cam in a 70 cuda. That would be running 55-60
mph. If I run it hard maybe 5-6 mpg
logan426
Posted By: Finoke
Re: 426 hemi mpg what are you getting in yours - 10/16/06 01:04 PM
Quote:
That really isn't as bad considering that I rarely get more than 12 mpg around town in my 4.6 thunderbird.
My wife has a 2005 T bird. REally bad on gas, unbelievable!
Posted By: Slipknot440
Re: 426 hemi mpg what are you getting in yours - 10/16/06 02:58 PM
Haven't got the hemi done yet but the 440 in my 68 RR, auto, 3:91, bored 30 over, mild cam, 9:1 pistons, carter 750 gets about 14 at 70 mph.
I'm expecting 11 out of the hemi on the hiway
Posted By: Dartman440
Re: 426 hemi mpg what are you getting in yours - 10/17/06 04:42 AM
I get 16 miles to the gallon in a 69 RR 472 Crate motor with a single 4 barrel and 850 Holley with a Keisler 5 Speed and a 4:10 rear doing 75MPH @2200 RPM.
Posted By: rm23j8g
Re: 426 hemi mpg what are you getting in yours - 10/17/06 12:33 PM
My totally stock 68 4 sp 3.54 geared RR gets around 11-12...doing typical to and from cruise duty in a suburban area. I drive pretty gently though..at least most of the time.
Incidentally, it gets better mileage than my 4 speed 3.91 geared AAR doing the same thing.
Posted By: sunroofgtx
Re: 426 hemi mpg what are you getting in yours - 10/17/06 01:21 PM
Gas milage ??...gas milage ??...Hahahahahahah.. I supposedly have a big buck , 20 gallon Triangle MFG. tank, which only holds 18 gallon's ( they lied), From my house to Summit is 37 miles, it took alomost all 18 gallon's to get there.
Probably had a quart to go.. I don't know..472, 10.5 to 1, 4.10's, 28" tall tire.I like to cruise at 3500 RPM..Single 1050 Dominator, and no, I didn't keep it on the "front" two the whole way there..
Posted By: 2Bad360sfromNC
Re: 426 hemi mpg what are you getting in yours - 10/17/06 10:56 PM
My 318 Challenger got about 7 mpg (the carb was junk) before I put the 360 in it. If you ever do get worried about fuel economy, I'll trade you the slant six out of my Valiant for your Hemi. It gets 21 mpg all day long in town.
Posted By: therocks
Re: 426 hemi mpg what are you getting in yours - 10/17/06 11:52 PM
Sunroof you sound like me.My 65 with the 440 gets about 3 MPG.That Dominator sure likes to suck gas.My thought is if you can afford a Hemi you can afford the gas.Worst part is with the 12.5 pistons I have to run at least 1/2 110 octane at over 5 bucks a gallon.But I didnt build it to see how much MPG I could get just HP.Rocky
Posted By: kwikblownhemi
Re: 426 hemi mpg what are you getting in yours - 10/18/06 12:44 AM
1969 Super Bee 3660 lbs
472 CI, 9.5 CR
Iron heads with bowl work flow 367 @ .700, 330 @ .400
Comp .557/.540 252 @ .050 With stock rockers,intake lift at valve is only .485"
JR 2" headers 3" exhaust with X pipe
MP Dual plane with cleanup and divider milled 5/8"
800 Holley DP with 68 primary jets and enlarged power valve channel restrictions
Ford EDIS distributorless ignition controlled by Megasquirt
Four speed/ Dana 3.54/ 295x50x15 Hoosier QT
On radial rear tires, the car consistently got 12-14 MPG during easy driving and ran mid twelves at 118. The switch to the QTs has dropped it about 1 MPG I've programmed the ignition for 42 degrees advance at light load cruise conditions. I didn't see any gain from the original 35 degrees. In spite of the reduced primary jet size, the O2 sensor shows the engine to still be rich at cruise, with inlet air temps running about 130-140 degrees. Once I've finished the EFI install, I expect to see a well tuned 14-15 MPG.
The Indy intake is probably hurting your mileage. I modeled it for my 472 on Engine Analyzer Pro and it really knocked the bottom out of the torque (and efficiency) in the 2500-2700 RPM cruise range. Still, with tuning, you should be able to increase your mileage significantly. Everyone has their opinion, but a fuel efficient Hemi is nothing to be ashamed of
Roger
Posted By: Anonymous
Post deleted by Defbob - 10/18/06 01:08 AM
Posted By: minivan
Re: 426 hemi mpg what are you getting in yours - 10/18/06 02:13 AM
Back in the day, around 73-74, my A12 sixpack SuperBee, got between 6-9 MPG on that 36 cents a gallon super.. Bout drove me broke feeding that thing...
Posted By: Triggerfish
Re: 426 hemi mpg what are you getting in yours - 10/18/06 03:00 AM
426 70 Challenger auto 373's...easy pressure, crusing about 8-11 mpg. With foot in it, 3-4 & you can watch the needle sweep thru 1/8th of tank in one romp.
Posted By: dwbiggs
Re: 426 hemi mpg what are you getting in yours - 10/18/06 04:00 PM
Quote:
426 hemi mpg what are you getting in yours
This is like somebody marrying a hot blonde and wondering why she doesn't cook or do any house work.
Dan
Posted By: michaelphbarnett
Re: 426 hemi mpg what are you getting in yours - 10/14/08 07:25 PM
Quote:
I have just under 225 miles on the car so far. I didnt build it for fuel economy, but I thought it would be better than what it is. I am getting between 7-8 mpg out of the car so far. How you others doing with yours.
Mine gets 5 to 8 MPG using premium.
Posted By: GTX MATT
Re: 426 hemi mpg what are you getting in yours - 10/14/08 07:53 PM
Yeah mine gets no miles to no gallons
Posted By: Anonymous
Re: 426 hemi mpg what are you getting in yours - 10/14/08 08:01 PM
Quote:
You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me. Dave
liar!
Posted By: Hemi_Joel
Re: 426 hemi mpg what are you getting in yours - 10/14/08 08:48 PM
Quote:
Quote:
You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me. Dave
liar!
A fellow I know bought a new 69 RR 3.54 4 speed. Stone stock, never messed with it. He claimed that on a trip to CHicago he pulled down 17 mpg.
I never get that good cuz I have a lead foot. 9 - 10 mpg is about it for me. 
Posted By: Anonymous
Re: 426 hemi mpg what are you getting in yours - 10/14/08 09:44 PM
About 7 or 8 years ago I went on a 200 mile highway trip with my 69 Hemi GTX. As I was driving it became harder and harder to go up hills without it pinging. I finally made it to my destination and after checking it over, sure enough the timing had advanced to almost 50 degrees total. I got close to 20 MPG on that trip. Huge advance and having to featherfoot it on the hills does have it's advantages.
Sheldon
Posted By: HealthServices
Re: 426 hemi mpg what are you getting in yours - 10/14/08 10:15 PM
maybe 1/2 a tank of race fuel per 5 runs...
Lets see track 1/4 mile, 1/2 shut down, run thru pits round up to 1.5 mile...
~7.5 miles per 8 gallons, .9375 gallons per mile or 1.137 miles per gallon.
Posted By: quickd100
Re: 426 hemi mpg what are you getting in yours - 10/14/08 10:42 PM
Well you guys can call me a liar again. Labor day I drove my truck to a car show. Highway/city 13.18mpg, the LM-1 showed 14.2-1 A/F ratio most of the time. I could lean it out more but like to make sure it's safe.
528 Hemi, compression is 10.6-1, Weiand tunnel ram with 2 850+cfm Thermoquads, MP cam 272/274@.050, TA 10" converter, 4.56 gears, 31" tall tires. Timing 30 degrees at idle, 35 degrees@ 2000rpm Cruises at 3400rpm.
It's really hard to stay out of the throttle too. Dave
Posted By: doctor_mopar
Re: 426 hemi mpg what are you getting in yours - 10/15/08 12:35 AM
70 Hemi Challenger Automatic with 4;10 gears. 5 MPG aroud town. Many stop lights !
Posted By: SCATPK
Re: 426 hemi mpg what are you getting in yours - 10/15/08 03:40 AM
I took my gtx on a 750mile round trip a few months ago and averaged 10 miles to the gallon driving 65-70mph. Engine is a 528 bored .060 so 542 cubic inches with a hyd cam 242/242@50 with stagev intake with 2 650 carbs and 354 gears. Years ago had a stock 426 in it with factory 1970 hyd cam and took the same trip and averaged 14mpg.
Posted By: gremlinsteve
Re: 426 hemi mpg what are you getting in yours - 10/15/08 05:56 AM
built a 426 a few months ago. car ended up pulling down right at 22 mpg on the highway. this was a new gen (third) hemi tho.
car made 610 at the wheel also...
for comparison sake
steve-o
Posted By: B G Racing
Re: 426 hemi mpg what are you getting in yours - 10/15/08 11:23 AM
One of our guys(Frank Challinor)who owns the Copper Bandit 67 GTX,528 Hemi,single carb,3.73 gear.T/F.has put on 1700 miles the last few months and is adveraging 11 mpg.
Posted By: lewtot184
Re: 426 hemi mpg what are you getting in yours - 10/15/08 01:35 PM
this may not be an apples to apples comparison. i have two cars, b-bodys, both with 440 6-paks, automatics, 3.23 rears. one car is a 69 r/t 272-.455 mopar came, stock exhaust and converter; it'll get around 15mpg on the highway. the other has an engle solid cam (238@.050-.510 lift), street hemi converter, big tti exhaust; it'll do a little over 14mpg. i run vacuum advance distributors and tailor them for driviability. i think the small center carb and vacuum distributors are a big help for mpg and also kept the engine cleaner. big carbs, single plane intakes and full centrifugal distributors wittle away at mpg.
Posted By: Dragula
Re: 426 hemi mpg what are you getting in yours - 10/15/08 06:03 PM
I get 7-8mpg on my 484 Hemi, and I used to get 15mpg with my +0.030" 426 and different cam. It gets a lot worse if you step on it....
All with 4.10's and 31" tall tires and a tight 10" convertor.
Posted By: sixpackbee
Re: 426 hemi mpg what are you getting in yours - 10/15/08 06:12 PM
Quote:
426 siamese block
10.25 to 1 j and e piston
manely rods
eagle crank
426-2 indy intake
850 mighty demon
comp cams 508/519 235 at 50 mechanical cam
msd
2 1/8 hooker super comps
3 inch flowmaster exhaust
bowl and pocket work on the mopar aluminum heads
dana 60 with 3.54
4 speed
29.5x15.5x15 rear tire
2850-3000 rpm's at 70 mph
car weighs in at 3640 with a 1/2 tank
I have almost the identical set up. I have 10.7 to 1, stock intake and carbs, stock iron heads, but everything else the same. I get around 16-17MPG at 60-65ish. Around town it gets bad but the front carb seems to want to be open more frequently.
Posted By: TJP
Re: 426 hemi mpg what are you getting in yours - 10/16/08 01:06 AM
4.26 MPG in town,
5.72 on the highway, Who cares???? LMAO
Not trying to slam you but just inject a bit of humor
Posted By: michaelphbarnett
Re: 426 hemi mpg what are you getting in yours - 11/23/10 08:06 PM
Quote:
4.26 MPG in town,
5.72 on the highway, Who cares???? LMAO
Not trying to slam you but just inject a bit of humor
Posted By: Sunroofcuda
Re: 426 hemi mpg what are you getting in yours - 11/23/10 09:11 PM
Back in the era when I used to have my '71 Hemi Charger (1980-84), mine would always get around 12 MPG around town, & 16 on the highway. That car ran like a swiss watch!
Posted By: Keith Black®
Re: 426 hemi mpg what are you getting in yours - 11/23/10 10:00 PM
at full power will empty a tank in approx 3 minutes.
we should be measuring fuel consumption by seconds or minutes not mpg
Posted By: torkrules
Re: 426 hemi mpg what are you getting in yours - 11/23/10 11:41 PM
Quote:
I have just under 225 miles on the car so far. I didnt build it for fuel economy, but I thought it would be better than what it is. I am getting between 7-8 mpg out of the car so far. How you others doing with yours.
my set up is
426 siamese block
10.25 to 1 j and e piston
manely rods
eagle crank
426-2 indy intake
850 mighty demon
comp cams 508/519 235 at 50 mechanical cam
msd
2 1/8 hooker super comps
3 inch flowmaster exhaust
bowl and pocket work on the mopar aluminum heads
dana 60 with 3.54
4 speed
29.5x15.5x15 rear tire
2850-3000 rpm's at 70 mph
car weighs in at 3640 with a 1/2 tank
What do you think and how are yours doing. This is still a lot better than my max wedge was doing.
Just over 200 miles from a tank. somewhere around 14.6mpg (Imperial gallons=15.75 Imperial gallons to a tank)
Posted By: CRE2004
Re: 426 hemi mpg what are you getting in yours - 11/24/10 01:33 AM
We averaged between 10 and 11 on the road. 572 hemi with a 3.73 rear gear.
Posted By: Slipknot440
Re: 426 hemi mpg what are you getting in yours - 11/24/10 02:06 AM
about 10 on the highway with 3.91 and an auto. HP and tq below 9.1 compression
Posted By: rr74cuda
Re: 426 hemi mpg what are you getting in yours - 11/24/10 03:07 AM
Mine gets great gas mileage from me pushing it around on the stand. Dont know how many calories an hour though and I seem to produce less torque than I use to. Of course the engine is a 66 and I am a 60 model
Posted By: Mopar_Rich
Re: 426 hemi mpg what are you getting in yours - 11/24/10 05:19 PM
I get 13.9 MPG with my 572 EFI HEMI.
But I had to do some special EFI tuning to do it.
Running very lean at low load conditions.
Lots of spark advance at low loads.
Shut off all the injectors on an decel.
Hold back on the acell fuel (pump shot) unless you mean it.
I run 91 octane, push button 727 trans and 3.70 rear gear.
Posted By: torkrules
Re: 426 hemi mpg what are you getting in yours - 11/24/10 06:27 PM
Quote:
Mine gets great gas mileage from me pushing it around on the stand. Dont know how many calories an hour though and I seem to produce less torque than I use to. Of course the engine is a 66 and I am a 60 model
Posted By: torkrules
Re: 426 hemi mpg what are you getting in yours - 11/24/10 06:28 PM
Quote:
I get 13.9 MPG with my 572 EFI HEMI.
But I had to do some special EFI tuning to do it.
Running very lean at low load conditions.
Lots of spark advance at low loads.
Shut off all the injectors on an decel.
Hold back on the acell fuel (pump shot) unless you mean it.
I run 91 octane, push button 727 trans and 3.70 rear gear.
show off
Posted By: Beebuzzn
Re: 426 hemi mpg what are you getting in yours - 11/24/10 07:29 PM
My old 67 Hemi R/T 4 spd. with alittle head work small hyd.cam, stock comp. would get 14 mpg on highway. That's with stock 14" wheel and tire combo and stock 3:54 gearing at 65 mph.
Posted By: max
Re: 426 hemi mpg what are you getting in yours - 11/25/10 12:21 AM
My 426 isn't anything special. Stock bore and stroke with 11.5-1 compression and stock iron heads with an M1 intake and a 750 CFM Holley along with a .525/292 cam. The car is an automatic with a stock 1800 stall convertor along with 3.31 gears.
From what I have driven the 1970 Challenger my milage is running about 10 MPG with mixed town/highway driving coarse there was a
in there.
Posted By: Curt
Re: 426 hemi mpg what are you getting in yours - 11/25/10 03:08 AM
Kinda related...but not really... I drove a 08 duramax diesel w/allison on a 6.7 mile test drive today...trip computer said I used 1.3 gallons...I was in it a little
Oh yeah the best I got was a solid 10MPG 525 cube Stage V heads and intake, 245@ and about 550 lift. 354 Dana in E-body.
Curt
Posted By: michaelphbarnett
Re: 426 hemi mpg what are you getting in yours - 11/08/12 02:42 AM
Quote:
4.26 MPG in town,
5.72 on the highway, Who cares???? LMAO
Not trying to slam you but just inject a bit of humor
Posted By: DAYCLONA
Re: 426 hemi mpg what are you getting in yours - 11/08/12 05:01 AM
Quote:
I get 16 miles to the gallon in a 69 RR 472 Crate motor with a single 4 barrel and 850 Holley with a Keisler 5 Speed and a 4:10 rear doing 75MPH @2200 RPM.
Same here,....the last few 472's that I fabricated 6 bbl inductions for, running Keisler TKO's .64 OD with 3:54 to 4"10's would avg about 16-18 MPG crusing at approx 80 MPH on cross country events
Mike
Posted By: az426john
Re: 426 hemi mpg what are you getting in yours - 11/08/12 11:15 PM
Relatively stock 426 Hemi 9.5 CR, mild Comp cam, 3:23 gear, automatic
about 14 mpg @ 70 mph, 3,000 RPM highway mileage.
Posted By: HemiStan
Re: 426 hemi mpg what are you getting in yours - 11/09/12 03:02 AM
Quote:
You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me. Dave
I am the current caretaker of Dave's GTX. The Hemi is currently 472 ci with the stock carbs, a very old (1969?) outdated and unefficient Sig Erson cam with lots of duration, and a very heavy foot on my part. I drive this car ALOT. All over New England this summer and down to NC a couple weeks ago. Even with my hard driving, she still manages just shy of 12 MPG. I am amazed! I really think that even with the current set-up, I could get 14 MPG if I would just calm down for a bit. But, that is probably not going to happen.
Posted By: HEMIDOG 70
Re: 426 hemi mpg what are you getting in yours - 11/09/12 04:45 AM
I just made my first small trip in my 528 hemi about 20 mi each way. It done around 8.5mpg mixed in town and hi way driving with a couple
in between. Combo is Barton 528 factory inline intake 2 edelbrocks 10.5 compression 280 660 lift cam 4spd with a 373 gear. It's thirsty but it's fun.
Posted By: quickd100
Re: 426 hemi mpg what are you getting in yours - 11/09/12 12:06 PM
With the 605 in the truck I've checked it twice. Both times a solid 8mpg. I can live with that.Dave
Posted By: Sunroofcuda
Re: 426 hemi mpg what are you getting in yours - 11/10/12 04:37 AM
My old '71 Hemi Charger R/T w/3:55 gears used to get around 12 MPG in the city, & about 15 on the highway. Car was all stock except for the heads being redone back in the later 70's - a place in Detroit called "Corky's" did them. I was the second owner of the car & bought it in 1980. Lost it in a fire in Aug, 1984. RIP old friend. And yes, oddly enough I did regularly check the fuel mileage just out of curiosity.
Posted By: Pale_Roader
Re: 426 hemi mpg what are you getting in yours - 11/10/12 01:59 PM
WOW... Just... wow.
There are some staggering figures in here. I'm going to assume that with all the money usually spent on a hemi that these are generally well-tuned engines too, not just off-the-lot factory engines tuned by the local Dodge tech every month.
Why are they so damn thirsty then? I see lots ov single carb (non Dominator) hemis in here too... still thirsty. Is this a sign ov a generally inefficient engine design? I'm sure Hemi's are fun, and its hard to stay off them, but its not like the 440 guys in here are driving like grannies...
Posted By: Lee446
Re: 426 hemi mpg what are you getting in yours - 11/10/12 02:32 PM
In 09 I drove my 69 Sat from Houston to Detroit and back for Woodward. It has a 528 Hemi/TF/3.54 Dana. Then, it had the MP crossram, twin Holley 770's and a
266@50/650 solid cam. Running 65 all the way up and back with the A/C on, it got between 8-11 mpg. With a Dynamic 3600 stall converter, I always wondered how much a tighter converter would have helped.
Posted By: quickd100
Re: 426 hemi mpg what are you getting in yours - 11/10/12 11:22 PM
I consider 8mpg pretty decent. The cam is a solid roller .767/.676, 288/292@.050. Tunnel ram with 2 850 thermoquads, 4.56 gears with 31" tires. I've had a 6000 stall 8" convertor and a 10" 4000 stall in it. The mileage was the same, (I did have to drive it real nice though).Dave
Posted By: Slipknot440
Re: 426 hemi mpg what are you getting in yours - 11/11/12 12:36 AM
about 7/8 city 10 hwy with carb. Now 10 city, 14 hwy with EZ EFI (727 auto trans)
Posted By: HEMIDOG 70
Re: 426 hemi mpg what are you getting in yours - 11/11/12 01:49 AM
Hemis are actually a very efficient design. They have very large valves 2.25 intake etc. In my case it's 500 plus cubes a pretty large solid cam and a heavy right foot
My 87 4x4 250 Power Ram only got 8.5 mpg it was a 360 with a Qjet 4bbl and 4.10 gears.
Posted By: Prince_Valiant
Re: 426 hemi mpg what are you getting in yours - 11/11/12 07:15 AM
I calculated mine at "I don't care"
Posted By: Hemi ragtop
Re: 426 hemi mpg what are you getting in yours - 11/11/12 01:23 PM
I drove 114 miles last weekend to a car show. The route was stop and go and about half freeway. My setup is a 540ci HEMI with (2) 750 Hollys on a Stage V intake. The cam is 248/254 @ .050 solid roller. Compression is 10.8. The 727 has a 3500 converter and the Dana has 3.54 gears. The car averaged 10.8 mpg. When I first started driving it the mileage was 7-8 mpg. I tuned the carbs with a vacume gauge and hooded up/tuned the vacume advance in the MP distributor to get the 10.8 mpg. I don't think that is too bad for a 4000lb car and a 540 ci engine spinning 2800-3000 rpm on the freeway.
