My 05 1500 got 15mpg on a 500 mile trip towing a 1500 lb car trailer (guessing it's 1500lbs, it's your standard 4" channel car trailer with dual 3500lb axles). Got 12 mpg on the way back towing a '67 Coronet, was doing between 70-75 mph on the way out, and stuck closer to 70 on the way home, and that's driving it with authority, no hypermiling going on.