I have a Ford Excursion 4X4 Diesel now, it gets 22MPG so it does pretty good. It would tow our boat up the Baker Grade 70MPH @1900RPM about 8000lbs. It has a PPE Programmer in it 10 Stage, I only have it on Stage 5 with no changes to the transmission shift, other than that it is all stock. That big azzz thing gets great mileage and most diesels do, those Tree Huggers are Wack!