I have a 2013 F250 with the 6.2. It's a CC LB 4X4 with 3.73 rear. I get 15.8 - 16.1 on the highway at 70 (hand calculated) running 85 or 87 octane fuel.
It does ride a bit rough but I figure it's a 3/4 ton truck with solid axles. I drive a sedan day to day.
Remarkable mileage, indeed.
