rjstractor wrote:
That is really good mpg, my 2000 F250 7.3/6MT gets around 14 towing whether I'm towing a 3000 lb 6x12 enclosed trailer or a 14' dump trailer full of firewood. I've never towed an RV with it but I imagine it would get worse. I did average an honest 20 mpg running empty on many miles of 60 mph two-lane. It's only got 170K on the clock so hopefully just getting broken in.
My 7.3 example above is in my Excursion which is also 4wd. In my old 99 7.3/6MT F-250 solo will run 21 mpg as well if you keep it below 65mph. It doesn't get used much because it's a single cab 255k miles.
The new small Diesels have the same power and better mileage.