What's the secret to retaining good gas mileage in a performance application?

[HotRoddin]

Originally Posted by 4barrel

http://www.chevrolet.com/corvette/sp...s/#fueleconomy
Fuel Economy Engine EPA Estimated MPG city/hwy.
6.0L LS2 V8
4-speed automatic transmission 18/26
6-speed manual transmission 18/28

Falling from an airplane maybe lol ... or in some Chevy Engineers dreams

Seriously, I might buy that if it runs on 4 cyls on the open road like GhettoPop said the Magnum did, otherwise Chevy must have tested it on solid rubber tires, stripped to bare fiberglass with a 40 MPH tailwind.
Remember also that all the veh manufactures are in hot water right now for vastly overstating fuel economy.

Rod

[GhettoPop]

that vette 28 mpg from the highway seems overtsated as HotRoddin mentioned. have you ever bought a new car that got the manufacturer's stated highway MPG? no one i know has.............the vette is good for low 20's MPG on highway, case closed..........who cares anyway, its an f'ing chevy!

back to real vehichles equipted w/ 302's, Vector, w/ heads/cam/intake your milage will go down, but i think the power added will be more than worth the trade off! how many miles do you really make? unless you do TONS of driving, i would not worry about it. if you do make tons of milage, buy a 4 cyl daily driver and make that 302 a real monster!!!!! and BTW, the long tube headers might increase your MPG, even if just slightly.

[Vector]

Originally Posted by GhettoPop

that vette 28 mpg from the highway seems overtsated as HotRoddin mentioned. have you ever bought a new car that got the manufacturer's stated highway MPG? no one i know has.............the vette is good for low 20's MPG on highway, case closed..........who cares anyway, its an f'ing chevy!

back to real vehichles equipted w/ 302's, Vector, w/ heads/cam/intake your milage will go down, but i think the power added will be more than worth the trade off! how many miles do you really make? unless you do TONS of driving, i would not worry about it. if you do make tons of milage, buy a 4 cyl daily driver and make that 302 a real monster!!!!! and BTW, the long tube headers might increase your MPG, even if just slightly.

Hey, yeah I really do want to make this thing a monster . I only drive to and from work every day, so I don't put a ton of miles on it really. I asked about the long-tubes because this book tells me the oxygen sensor being so much farther down-stream in the exhaust system, it does not have as great an accuracy for measuring unburnt hydrocarbons. Thus it can't adjust the air/fuel ratio as efficiently, thus perhaps it would impact gas mileage. I don't know.