Originally Posted by 4x4ord
Pulling I have gotten as poor as 5.5 mpg. That was pulling an 18000 lb trailer bucking a pretty good wind. I have seen 8.5 mpg pulling a 14000 lb RV no wind. Empty and driving a steady 60-70 mph all highway I have seen 17.5 mpg. I have 20" wheels and the 3:55 gears. I expected better.
I had an 07.5 Dodge with the 6.7 Cummins in it. It was totally stock, 3:55 gears and was lighter than the Ford. The best it could ever do empty on the hwy was about that same 17.5 to 18.5. I think the days of getting 20 mpg on a 7500 lb CCSWB 4x4 truck are over. With the fuel used for regens and all of the other emissions stuff I just don't know if it is doable anymore