We used my diesel Ford bus to pull on a few weeks ago, the new Sliderphoto house/shop. The temperature was about 10 when we pulled it and there was a very stiff wind, so my fuel mileage was way down. And I really railed to get up to the ice. Anyway, fuel mileage was about 10. I have pulled my 18foot 10,000k enclosed auto hauler and gotten a consistent 13, with 14.5 being the best.