We have a 2011 F350 SRW 355 gears 400Hp 800 Ft.Lbs torque towing a 16,000 lb Big Horn 5er. Towed East to the Dakota's, Montana, Idaho,Wyoming, Neveda, north to Washing south to L.A. Ca. Have to agree that this combo is a pulling dream. It pulls grades of 6% with ease. Mileage towing varies from...