[PAFirefighter11]

Originally Posted by Godofelru

You'll have to forgive me, your post seemed to emphasize first that you hate paying for gas because you drive 250+ miles weekly. I get that you want more performance for your economy, but more power will tempt you to open it up more often.

Regardless I support any decision most of those cars are awesome (Including the M )

Using myself as an example.

My stock Spec V was fun to drive and I could see upwards of 37 mpg on the highway and around 25 city; thus averaging about 28-29.
My Spec V @ 300whp saw about 31 mpg highway and about 22 city; thus averaging high 20's.

Stock running around WOT all the time and running to redline. I was seeing close to 20-22mpg average.
Boosted running around WOT is like 15mpg. See how much this affects by increasing the power? More power = more fun = more fuel usage.

Keep that in mind when you make your decision.

I went back to edit it - added that I also want more sound and power ;-) More power on the same car = less hp. But, it's all about car design (aerodynamics), efficiency of the motor and drivetrain, etc., etc., as we know when it comes to power and MPG. Look at my favorite examples and my M3:

1998 BMW M3 - 5 speed - 18/26 MPG - 240hp Inline 6 - 1/4 mile: 13.7.
2000 Camaro SS Coupe - 6 speed - 16/25 MPG - 325hp V8 - 1/4 mile: 13.5.
2000 Pontiac Trans-Am WS-6 - 6 speed - 16/25 MPG - 320hp V8 - 1/4 mile: 12.9.

80+ hp and only 1-2 MPG less on both ends is not bad ;-)