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      08-11-2011, 09:57 PM   #116
Lieutenant Colonel

Drives: Legacy GT - 13.704@99.39
Join Date: Jul 2007
Location: Manheim, PA

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Originally Posted by erhanh View Post
Trying to get 30mpg in a car that is designed to be driven hard is kinda off... If you're going to baby it to get 30mpg, why are you buying an M3?
Wouldn't it be nice if the current M3 got 30 mpg if you babied it? On track, seven mpg is fine, but the miserable mileage is THE weak point of the current offering. Hell, owners of the the 3900 pound Camaro SS tell me they routinely get high twenties to 30 mpg running 75 mph or better out on the road.

Originally Posted by erhanh View Post
BTW, even if you are not WOT, still the same thing. if you need 150hp to accelerate, you will burn same amount of fuel whether NA or turbo or sc...
I agree, mostly.

Just a nit, and it's not actually written in stone, but manufacturers typically run their turbo/supercharged offerings a bit richer than their normally aspirated models at wide open throttle in order to reduce peak combustion temps and ward off potential pinging or detonation. Result: More fuel used for a given power level at WOT.

In addition, supercharged cars require you to "feed the blower" as drag racers say, because the power required to run the supercharger is real power made by the engine that never makes it to the flywheel. Those ponies are just as hungry as the ones that make it to the wheels.