Originally Posted by KMPrenger
Actually, the final drive ratio is the same between the two if my memory is correct (3.27) so I too am a bit surprised the ATS does not have a small MPG advantage. Only the 2LS Camaro has highway MPG rating of 30 because it has a 2.92 final drive ratio. Other V6 Camaros are rated at 28 MPG.
I wonder if there is something else affecting mileage for the ATS, or if the weight loss really doesn't help mileage much?
Keep in mind that just because a car loses mileage compared to another on the EPA test doesn't mean there is actually a difference in the real world. The EPA tests are inaccurate, and since car makers are more often trusted to run the test themselves (see Hyundai/Kia), they are almost not even useful for comparative purposes.