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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: 7,479
Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,479
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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