i have a 01 ford f250 with the 7.3 turbo diesel it has everything, 4x4 lariat bla bla bla has the short bed for looks and turning radius, but is the four door so...... On 285x75x16's i get 17 on the interstate no load and 14 around town no load. single car trailor and a light sports car (rx7, Porsche, Supra, ect) it gets about 12 on the interstate and 10 around town. you can chip the truck and it will get upwards of 20 without a trailor.