My 2012 F-250 Super Crew King Ranch 4x4 6.7 Diesel gets 15 in town & 21mpg on the Hwy. That's unloaded, of course. I've really never checked my mileage when hauling a load, but it really seems to not use all that much more fuel loaded.
It will pull any damn thing you can hook on to it without ever straining the diesel .
That's what I liked about having diesels (I've owned four since 1988). The Tundra that I own now will happily tow 10,000# any and all day, but it has to go into higher gears and higher rpm's to do it. Not a biggy, but when you've gotten used to the raw low end power of a diesel, it's hard to go back to gas.
