Gas mileage/effeciencey 426 HEMI
#2338061
07/16/17 10:50 PM
07/16/17 10:50 PM
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Joined: Mar 2010
Posts: 984
Tennessee
Hemi ragtop
OP
super stock
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OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
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I drive my HEMI convertible, all I can. I am often asked, what is the gas mileage? If you drive a HEMI convertible to a car show and take the hardware home, who cares? But after 5 years and 6,000 miles, I thought I would check it. Now I know how to produce good mileage numbers, but real world? I filled up just before the entrance ramp on I-75 and drove 74 miles just as I would my company truck, 70-80mph depending on traffic.
The car is a 66' Coronet convertible with a 540" HEMI, two 750 Hollys on a Marine intake, 4175lb empty, (add 400lb. for two passengers, 3.54 gear, 250+ 11" torque converter and Gear Vendors overdrive.
The tack stayed at a steady 2,200-2,500 rpm. If I got behind a truck, I passed it!
We had many horn blows, and thumbs up as we made the trip.
We came off the interstate and filled up at the same pump, 12.9 mpg.
4.5" stroke, Mopar Performance heads, 10.78 compression, .248/.254@ .050 cam on 112 l/c
cam
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Hemi ragtop]
#2338132
07/17/17 12:40 AM
07/17/17 12:40 AM
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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 was able to tune my EFI 572 HEMI with 3.54 gears to yield 14 MPG in my 1964 4000 pound Dodge with no compromise in drivability. That would be hard to do with a carb and normal ignition since I not only leaned out the cruise area but I also emulated vacuum advance with the timing. Never opened the hood.
Last edited by Mopar_Rich; 07/17/17 12:42 AM.
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Dragula]
#2338189
07/17/17 05:47 AM
07/17/17 05:47 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Your lucky, my 605 gets around 6.5 with one big carb. Jesus... thats not a carb, thats a toilet with a 1" fuel line attached...
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Mopar_Rich]
#2338200
07/17/17 08:01 AM
07/17/17 08:01 AM
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Joined: Mar 2010
Posts: 984
Tennessee
Hemi ragtop
OP
super stock
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OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
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I was able to tune my EFI 572 HEMI with 3.54 gears to yield 14 MPG in my 1964 4000 pound Dodge with no compromise in drivability. That would be hard to do with a carb and normal ignition since I not only leaned out the cruise area but I also emulated vacuum advance with the timing. Never opened the hood. Rich, that is cool, wish I was capable of tuning as I drove the car!
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Hemi ragtop]
#2338279
07/17/17 11:44 AM
07/17/17 11:44 AM
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Joined: Oct 2007
Posts: 4,210
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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leaned out the cruise area but I also emulated vacuum advance with the timing
That^^^
Boffin Emeritus
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Hemi ragtop]
#2338283
07/17/17 11:51 AM
07/17/17 11:51 AM
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Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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I have gotten 10 mpg w/ my 572" hemi and a 1200 cfm dominator.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Gas mileage/effeciencey 426 HEMI
[Re: Hemi ragtop]
#2339130
07/18/17 03:14 PM
07/18/17 03:14 PM
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Joined: Oct 2012
Posts: 48
the Netherlands
dutchrunner
member
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member
Joined: Oct 2012
Posts: 48
the Netherlands
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69RR with572 hemi StageV heads , EFIMAN cam and XFI 2.0 (F&B six-pack TPI injection) with 727 and gearvendor 3.54 gears cruising 65 mph doing 18-19 mpg
1969 Roadrunner Sox&Martin tribute with 572Hemi and F&B performance Six-Pack XFI2.0 injection.
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