I agree with crossfiretech..... I'm a degreed aeonautical engineer and in a car for the street I couldn't care less about the drag coeffcient...... Now if we start talking high numbers in the coefficient of lift you will get my attention... My crossfire gets 23 mpg with around town and interstate driving and I just got back from a long road trip and got over 26 mpg with just interstate miles. I'm a very happy camper!!!