60 mph

[Chamberpains]

Depends on what your pulling, how much weight it is and what your using to pull it with. 8.94 mpg is fantastic if your pulling 80,000lbs +. You can probably get better if you didn't use cruise control when you're confronted with ANY size hill. Cruise is often way to ambitious in trying to keep you at your set speed. Instead, use your foot to pull ANY kind of hill and don't worry about how fast you get up it. Just be concerned with how far you push the peddle down. The less the better for fuel mileage.