You don't want to know. If I tune it down and run pump gas and drive it nice I get around 10 mpg. When I tune it up and run race gas and drive it like I normally do, which is like a f-ing nut, I get 4-5 mpg. You don't build a 500hp beast and worry about gas mileage. If that's a concern, you need to buy a new Dart. I built this to be fast, and fuel cost was never even thought of.
