I have an 06 with 265k miles. I consistently get 16-17 mpg empty. Mostly highway.CanyonAg77 said:Haven't run the diesel enough to know. The 8.1 gets 11mpg empty, can drop as low as 7-8 pulling an RV hard. Even less going fast or in wind or hills.schmendeler said:
Roughly, what is the improvement in fuel consumption?
Diesel is supposed to be 14-17 empty, and not much lower when towing.
Maybe a diesel guy can let us know.