The problem that most people don't consider when measuring fuel economy for a diesel powered truck is the "Regen" process. In one of these fuel economy tests all it takes for one truck to regen and the other two don't and that truck will have lowest fuel economy every time.
In order to get real fuel economy on a diesel truck is to drive the truck from 1 regen to the 2nd regen and then measure fuel economy. The engine that regen's the least frequent will have the best fuel economy.
BTW... Congrats on that new 2017 Super Duty 6.7PSD. They're a jewel. If I were ordering a truck today it would be hands down another F350 6.7 Power Stroke.
