Originally Posted by frdtrckmnrich
My 08 F350 4x4 dually w/4.10's gets an average 11.6. It is a noticeable difference from my old 85 6.9 getting 15. But it is a pulling machine! It drives the same loaded or unloaded.
Milage is my only complaint about the truck.
I think im getting better with the 6.9 now. After adjusting the fuel and adding some more oil to the fuel im getting lots less smoke and more mph.