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 15Likes
06-12-2008, 08:04 AM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
Sideoiler 427, tunnel-port heads, 2-4X4's and 3.77:1 gear with toploader = 9.5 mph when I'm peddling it. My Carbon Footpring is bigger than yours. 
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
Last edited by speed220mph; 06-12-2008 at 09:33 AM..
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06-12-2008, 08:06 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
gas mileage
last year trip to the London Cobra Show I got 20.8 mpg for the 1354 mile trip. We drove 70 miles in the rain on the way home and still had a great time.
Small block, fuel injected, 3:55 and a TKO 600
2006 I was hitting 101 mph on on the Main Street of London.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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06-12-2008, 08:09 AM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
390 FE, intake, cam, headers (duh), 735 carb, 9:1 cr, 425hp. My car runs on 87 and gets 10-11 around town and 12-13 highway. I recently changed out the metering blocks, so I still have to retune it all. Once done it should get about 15 mpg highway.
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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09-19-2020, 05:19 PM
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CC Member
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Join Date: Dec 2017
Location: Harrison,
AR
Cobra Make, Engine: BDR, 418
Posts: 175
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Not Ranked
Gas Milage???
Holy crap, you guy's actually figure your gas mileage? Good for you cause I don't have the ba**s to check mine...i guess next fill up I'll check it just for the hell of it. I've got a windsor stroked to 418 dynoed at 525 hp. 3:73 rear. I'm not real sure I want to know ablut this miles per gallon....sometimes ignorance is bliss!
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06-12-2008, 04:14 PM
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CC Member / Sponsor
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Join Date: Jan 2002
Location: Provo,
UT
Cobra Make, Engine: HiTech Legends GT500
Posts: 1,359
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Not Ranked
Quote:
Originally Posted by JustOne
Your Plugs may look ok, but you are way to rich! You need to get your car tuned with a wideband and get the car leaned out on the idle circuits and in your cruise range.
There is a very good articel on this in one of the Chevy magazines; google wideband and tuning a car for fuel mileage. With 3:73 gears a 750 MD carb combined with a 540 hp / 406, they got in the low 20s.
Justin
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http://www.chevyhiperformance.com/te...age/index.html
We have been tunning with a wide band O2 sensor. It is the best way by far to tune a carb. We have seen the transitions circuits be way to lean and beyond pig rich. It makes a huge improvement in driveabilty when it is right. |
06-12-2008, 04:40 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,029
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Not Ranked
385 series, 466 CI. Dual 660's with mechanical secondaries and center squirters. Mechanical advance distributor.
Only checked it once out of curiousity as I really don't give a rip. 6.5MPH, but I must get at least 50 to 60 smiles per mile.
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06-12-2008, 09:19 AM
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CC Member
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Join Date: Jul 2006
Location: Darnestown,
MD
Cobra Make, Engine: ERA 289FIA, 289 stroked to 331, 392 HP
Posts: 478
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Not Ranked
289 stroked to 331, 390HP, 360 ft-lbs. Over 20 mpg highway, approx 15 in town last time I checked. Recently I only know that mine uses approx 2/3 the gas that Tony's uses!
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06-12-2008, 09:43 AM
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CC Member
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Join Date: Dec 2002
Location: S.F.,
CA
Cobra Make, Engine: SPF 1474: 482 CI stroked tunnel port 427 with dual quads.
Posts: 237
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Not Ranked
With my stroked tunnel port motor set up and thirsty demon carbs (1450 cfm total) I average about 10 mpg highway and 5 mpg in town. The 5 speed tremec helps, but driving style is certainly reflected in the fuel economy ...or lack thereof.
Let's see, downhill in a hurricane I bet I could get over 20 mpg!
Funny story:
My friend and I approached a red light two weeks ago and we pulled up next to a Toyota Prius. My buddy had the driver roll down his window so he could yell over to him..."The gas you're saving, we're using!" The guy behind the wheel was a good sport and said he was happy it was going to a good cause. 
My brother in law drives a Hummer H2....the Prius owners aren't so forgiving... 
__________________
"Some things just get meaner as they get older"
.....Gumball Rally :-)
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06-12-2008, 10:02 AM
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CC Member
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Join Date: Feb 2006
Location: sacramento,
ca
Cobra Make, Engine: CSX4812, 511" SHELBY #578, TWM throttles, electromotive EFI/DIS
Posts: 56
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Not Ranked
Oh, I forgot my '06 F150 cruises about the same 1900 rpm freeway pushed by a little 5.4 and barely wrings out 16 mpg if your real carefull.
I have no idea what the truck weighs but it's gotta be a load when you consider the 5.4 liter is using almost as much as the 8.4 liter Shelby
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06-12-2008, 10:46 AM
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CC Member
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Join Date: Sep 2003
Cobra Make, Engine: ERA - 427
Posts: 56
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Not Ranked
ERA car, stock 428 CJ w/750 Holley got 11-mpg w/mechanical dist.
I switched to a vacuum advance distributor; no other changes and now 14-mpg
The vacuum dist is stock Ford with Pertronix, curved to factory specs for a 4V 390.
Of course if I want to I can get about 6-mpg…
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06-12-2008, 07:25 PM
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CC Member
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Join Date: Sep 2002
Location: Tucson,
AZ
Cobra Make, Engine: ERA 427" 351W
Posts: 562
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Not Ranked
496" side oiler
I sold my car, but the 2 times I checked mileage for ha ha's I was getting 12 mpg around town with the TWM and 3.54 gears. Had my foot into it a lot too! I checked it twice because I was amazed at the mpg, although I really didn't care what the mileage was.
__________________
Al W.
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06-12-2008, 12:00 PM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by WarrenG
289 stroked to 331, 390HP, 360 ft-lbs. Over 20 mpg highway, approx 15 in town last time I checked. Recently I only know that mine uses approx 2/3 the gas that Tony's uses!
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That is about right. 2/3rds the cubes.  |
06-12-2008, 12:19 PM
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CC Member
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Join Date: Feb 2007
Location: Valencia,
CA
Cobra Make, Engine: BDR #89, KCR aluminum 427 windsor
Posts: 322
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Not Ranked
427 Windsor, snotty cam, 0.82 overdrive, & 3.73 rear end.
On a 70 mph cruise, I'll get about 12 mpg. Around town, I get 8-10 mpg.
__________________
R. Smith
Santa Clarita, CA
BDR #89- KCR aluminum 427 windsor, TKO-600
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06-12-2008, 08:19 AM
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CC Member
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Join Date: Jul 2001
Location: Senoia,
Ga.
Cobra Make, Engine: 427SO with big twin autolite inlines on custom intake, jag rear, top loader, wembeldon white, guardsmen blue stripes
Posts: 3,155
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Not Ranked
Why would any big block Cobra owner sweat MPG?, I've never checked it and never will. People have ask me and I say. 'I have no idea and don't care', If you sweat MPG or value, you shouldn't own one......IMHO.
__________________
Perry
Remember!, there's a huge difference between a 'parts' changer, and a mechanic.
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06-12-2008, 08:28 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by 427 S/O
Why would any big block Cobra owner sweat MPG?, I've never checked it and never will. People have ask me and I say. 'I have no idea and don't care', If you sweat MPG or value, you shouldn't own one......IMHO.
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Agreed. When people ask me about my MPG I tell them "you can literally see the gas gauge needle moving before your eyes." |
06-12-2008, 08:51 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Glendale,
AZ.
Cobra Make, Engine: Cobray-C3, The 60's body lines on todays chassis technology
Posts: 2,302
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Not Ranked
Like Patrick I have an answer for mileage inquiries ... The fuel gauge moves a little slower than the Tach. I do know roughly what the fuel consumption of my big block is but only because I need to know if I can get home or not. I can not run pump gas because of it's compression. My big block is 540 inches and drinks at a rate of about 4 miles per gallon but every gallon is so much fun.
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06-12-2008, 09:13 AM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by patrickt
Agreed. When people ask me about my MPG I tell them "you can literally see the gas gauge needle moving before your eyes." |
Checking the range of the car for long trips and knowing how much further I can go before stopping. Other than that it really shouldn't be a factor.
The MPG is just a matter of division.
I am surprised I get over 10mpg.
Worrying about good gas mileage is kinda like people complaining about buying 200+ dollars a piece tires.
Spend all this money on a awesome car and then go cheap on what can hold you on the road.
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06-12-2008, 08:56 AM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
Quote:
Originally Posted by 427 S/O
Why would any big block Cobra owner sweat MPG?, I've never checked it and never will. People have ask me and I say. 'I have no idea and don't care', If you sweat MPG or value, you shouldn't own one......IMHO.
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When you don't have a fuel gauge, you pay attention to mileage  .
Besides, why waste fuel you don't need to waste?
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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06-12-2008, 09:53 AM
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CC Member
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Join Date: Feb 2006
Location: sacramento,
ca
Cobra Make, Engine: CSX4812, 511" SHELBY #578, TWM throttles, electromotive EFI/DIS
Posts: 56
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Not Ranked
511" F.I., 3.31:1 rear, tall 5th, 26.5" tire = 1900 rpm @ 75 mph and 14 mpg all day long chugging along effortlessly at 80 mph in the fast lane.
(the secret? EMS)
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06-12-2008, 11:15 AM
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CC Member
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Join Date: Feb 2008
Location: tucson,
az
Cobra Make, Engine: none yet but it will be mostly scratch
Posts: 102
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Neutral
I wish somebody would do the math..
If I spent 1000$ to get better mileage
Mostly smaller cam,carb,intake.
how long would it take to amortize the investment.
I drive a 500$ mitsubishi. It gets 30 mpg.
why spend 30,000$ to get 40mpg??
__________________
tim "FISH" fisher
Tucson,AZ & Kabul,Afaghanistan
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