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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31568
10/15/06 11:48 AM
10/15/06 11:48 AM
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Joined: Jan 2003
Posts: 20,740
A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,740
A collage of whims
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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.
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Re: 426 hemi mpg what are you getting in yours
[Re: topside]
#31570
10/15/06 12:06 PM
10/15/06 12:06 PM
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Joined: Aug 2003
Posts: 7,063
Indiana
maxie
OP
master
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OP
master
Joined: Aug 2003
Posts: 7,063
Indiana
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Re: 426 hemi mpg what are you getting in yours
[Re: 472 R/T SE]
#31577
10/16/06 12:46 AM
10/16/06 12:46 AM
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Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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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... 
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Re: 426 hemi mpg what are you getting in yours
[Re: michaelphbarnett]
#31579
10/16/06 07:27 AM
10/16/06 07:27 AM
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Joined: Jan 2003
Posts: 6,389
nielsville, minn.
quickd100
master
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master
Joined: Jan 2003
Posts: 6,389
nielsville, minn.
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: AlexP]
#31581
10/16/06 09:04 AM
10/16/06 09:04 AM
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Joined: Jan 2003
Posts: 4,104
Horsham, Pa.
Finoke
master
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master
Joined: Jan 2003
Posts: 4,104
Horsham, Pa.
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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!
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Re: 426 hemi mpg what are you getting in yours
[Re: Finoke]
#31582
10/16/06 10:58 AM
10/16/06 10:58 AM
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Joined: Mar 2004
Posts: 3,287
Dalton, MA
Slipknot440
master
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master
Joined: Mar 2004
Posts: 3,287
Dalton, MA
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: rm23j8g]
#31585
10/17/06 09:21 AM
10/17/06 09:21 AM
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Joined: Jul 2003
Posts: 12,129
Cleveland
sunroofgtx
I Live Here
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I Live Here
Joined: Jul 2003
Posts: 12,129
Cleveland
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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..  
Join the quickest team in motorsports. Team FireCore. CustomWiresets.com
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Re: 426 hemi mpg what are you getting in yours
[Re: 2Bad360sfromNC]
#31587
10/17/06 07:52 PM
10/17/06 07:52 PM
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Joined: Jan 2003
Posts: 21,065
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,065
Niles , Ohio
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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
Chrysler Firepower
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31588
10/17/06 08:44 PM
10/17/06 08:44 PM
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Joined: Feb 2005
Posts: 143
North America
kwikblownhemi
member
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member
Joined: Feb 2005
Posts: 143
North America
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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
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Post deleted by Defbob
[Re: michaelphbarnett]
#31589
10/17/06 09:08 PM
10/17/06 09:08 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: 426 hemi mpg what are you getting in yours
[Re: Triggerfish]
#31592
10/18/06 12:00 PM
10/18/06 12:00 PM
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Joined: Jan 2003
Posts: 3,329
Melbourne, FL
dwbiggs
super gas
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super gas
Joined: Jan 2003
Posts: 3,329
Melbourne, FL
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31593
10/14/08 03:25 PM
10/14/08 03:25 PM
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Joined: Jan 2003
Posts: 2,174
Costa Mesa, California
michaelphbarnett
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,174
Costa Mesa, California
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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.
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Re: 426 hemi mpg what are you getting in yours
[Re: quickd100]
#31595
10/14/08 04:01 PM
10/14/08 04:01 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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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!
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Re: 426 hemi mpg what are you getting in yours
#31596
10/14/08 04:48 PM
10/14/08 04:48 PM
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Joined: Jan 2003
Posts: 7,477
Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,477
Minnesota
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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. 
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: 426 hemi mpg what are you getting in yours
[Re: Hemi_Joel]
#31597
10/14/08 05:44 PM
10/14/08 05:44 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31598
10/14/08 06:15 PM
10/14/08 06:15 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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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.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: 426 hemi mpg what are you getting in yours
[Re: HealthServices]
#31599
10/14/08 06:42 PM
10/14/08 06:42 PM
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Joined: Jan 2003
Posts: 6,389
nielsville, minn.
quickd100
master
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master
Joined: Jan 2003
Posts: 6,389
nielsville, minn.
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31600
10/14/08 08:35 PM
10/14/08 08:35 PM
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Joined: Jan 2003
Posts: 1,043
Slidell, La.
doctor_mopar
super stock
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super stock
Joined: Jan 2003
Posts: 1,043
Slidell, La.
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70 Hemi Challenger Automatic with 4;10 gears. 5 MPG aroud town. Many stop lights !
------------------------ It doesn't matter what you do.........As long as you look good doing it !
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Re: 426 hemi mpg what are you getting in yours
[Re: SCATPK]
#31602
10/15/08 01:56 AM
10/15/08 01:56 AM
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Joined: Sep 2004
Posts: 1,828
houston texas
gremlinsteve
top fuel
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top fuel
Joined: Sep 2004
Posts: 1,828
houston texas
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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
if You Like Gremlinsteve. Gremlinsteve Likes You.
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Re: 426 hemi mpg what are you getting in yours
[Re: B G Racing]
#31604
10/15/08 09:35 AM
10/15/08 09:35 AM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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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.
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31609
11/23/10 05:11 PM
11/23/10 05:11 PM
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Joined: Jan 2003
Posts: 8,392
Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,392
Highland, MI.
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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!
No Man With A Good Car Needs To Be Justified
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31611
11/23/10 07:41 PM
11/23/10 07:41 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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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)
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Re: 426 hemi mpg what are you getting in yours
[Re: rr74cuda]
#31615
11/24/10 01:19 PM
11/24/10 01:19 PM
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Joined: Jan 2003
Posts: 1,938
Sonora CA
Mopar_Rich
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,938
Sonora CA
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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. 
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Re: 426 hemi mpg what are you getting in yours
[Re: rr74cuda]
#31616
11/24/10 02:27 PM
11/24/10 02:27 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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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 
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Re: 426 hemi mpg what are you getting in yours
[Re: Mopar_Rich]
#31617
11/24/10 02:28 PM
11/24/10 02:28 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: max]
#31620
11/24/10 11:08 PM
11/24/10 11:08 PM
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Joined: Jan 2003
Posts: 1,030
JAX FLA
Curt
super stock
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super stock
Joined: Jan 2003
Posts: 1,030
JAX FLA
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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
Oh yeah...THAT'S gonna leave a mark!
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Re: 426 hemi mpg what are you getting in yours
[Re: Dartman440]
#31622
11/08/12 01:01 AM
11/08/12 01:01 AM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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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
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Re: 426 hemi mpg what are you getting in yours
[Re: az426john]
#31624
11/08/12 11:02 PM
11/08/12 11:02 PM
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Joined: Jun 2004
Posts: 1,672
Virginia
HemiStan
top fuel
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top fuel
Joined: Jun 2004
Posts: 1,672
Virginia
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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.
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31627
11/10/12 12:37 AM
11/10/12 12:37 AM
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Joined: Jan 2003
Posts: 8,392
Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,392
Highland, MI.
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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.
No Man With A Good Car Needs To Be Justified
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Re: 426 hemi mpg what are you getting in yours
[Re: Pale_Roader]
#31629
11/10/12 10:32 AM
11/10/12 10:32 AM
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Joined: Jan 2003
Posts: 1,374
Houston,Tx.
Lee446
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
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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.
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Re: 426 hemi mpg what are you getting in yours
[Re: maxie]
#31633
11/11/12 03:15 AM
11/11/12 03:15 AM
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Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
Prince_Valiant
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
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I calculated mine at "I don't care"
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
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That sounds like a normal milage figure for that engine.
My 87 4x4 250 Power Ram only got 8.5 mpg it was a 360 with a Qjet 4bbl and 4.10 gears.
