Does anyone have any ideas as to why the GTO gets the gas mileage that it does? On the highway I am getting about 22 mpg. My '02 vette gets 31 mpg. What is the rearend ratio in a GTO. I know that the GTO is pushing more air, but 9 mpg difference between the two cars seems like a lot. What is the GTO's coefficient of drag? By the way, around town mileage is horrible (about 13 mpg)....but the weight of the car and my driving habits can probably explain that.