I am getting a lousy 12.5 MPG. I have ask my local Ford dealer about this, they tell me that all new diesels Chev, and Dodge are getting bad mileage because of the biodiesel fuel and the new emission requirments. He also told me that maybe sometime in June Bulldog Mfg. might be coming out with something to help with MPG on all diesels. They are working with the car maufacturers as not to void the warrities, Well see.