Fathers Day weekend I towed my Toyhauler to Pismo Beach and was really pleased with how the truck performed. My trailer weighs around 7500lbs. and there are many grades including part of the grapevine to pull going and coming. Truck pulled the grades just fine, the steeper grades were in 3rd gear at 55mph around 3800 rpm's. Lots of headwinds going over and got 7mpg. hand calculated. Coming home was calm weather and got 8mpg. hand calculated. I think if I was to tow mostly on flat ground I would probably get 10mpg or better.