I have a Limited, SWB, 4 x 4, Heavy Duty Trailer Tow (3.73 Rear End) , with our current hot outdoor temperatures (90's) I am getting 13.2 MPG according to the truck's computer, in city driving with frequent stop and go at traffic lights. My truck has about 1,200 miles. I have only made one short highway trip, I got 20 MPG driving between 70-75 mph, this trip with before having 1,000 miles, driving in 2H without any trailer etc.