Well,
I have the big boy dodge gas motor. Too bad it is not around anymore. I cannot complain about the mileage which has been consistent over the years. 8-10 Camper and Boat. 10-11.5 with just the camper. And as far as revs go I'm in diesel territory. 1600 RPM with over 400 lbs of torque at 57 mph. Hit a hill and go to drive I'm at 2300 RPM and approaching 450 lbs of torque. I have the 3.55 rear end and glad I specified it on this truck. The sunshine tax on Californie gas is a "little" stiff and need any help I can get!