As long as you keep off the gas so your not boosting then you can still get really good gas mileage... I was gettin around 300-350 miles a tank when it was stock and driving easy... Once I did some basic mods and was driving it hard I would get around 200 miles... When I would drive it easy I would get around 250-275... Just depends on your driving style. I also noticed a big difference if your going from city, highway, or country driving. Despite gas prices I'm still building a built motor with a monster turbo... I guess we'll just have to see how it goes after that.