Did you see that article in the new DieselPower mag? Garmon Diesel built a shortbed dodge 1500 with a p-pump 12valve.
There is a small blurb about the owner running the truck at like 1300rpm at 60mph, keeping it at 600 degrees, and basically driving like he was really old
Anyways...the truck returned something like 55mpg! Amazing!
Its a much smaller, lighter, and more aerodynamic package in the 1500 2wd chassis for sure....but stilll.....dang.
The engine is running twin turbos, extrude honed injectors, etc. It will lay down 700hp to the wheels on the rollers!
Cool.....
I love diesels!
With my truck and the 315s I think the sweet spot was about 1600rpm for 63-65mph. Look back a few posts for the California camper and tire fetch report. The truck AVERAGED over 20mpg with a best of 24.5! Not too bad at all! For the shape of a brick anyways!