Ford couldn't give those Triton V 10 motors away in pickup trucks, so they put them in motor homes, even dumber low torque and 3-4 mpg , what a combo !
Mine got 7 MPG on the way from the Fresno CA area to Eastern WA, uphill, downhill, flat, didn't seem to matter. And it pulled the hills OK...............for a 28' home. Didn't have many folks PO'd at me.
But I sure hated that gas mileage.
Geno