i get about 23 mpg avg in my stage 3 vf52ed 08. its about the same as i got stock and even stage 1. at a dealership i saw a new gt500 mustang today. the window sticker was i think 18 and 24! how the hell with 660 hp? man awd must rob some power. if you keep out of boost and shift around 3k i seem to get better mileage.