I've been looking at GM gas 3/4 tons and ran across a few F250s with the 6.8. What kind of fuel mileage does the 6.8 get and did it have the problem blowing spark plugs that the 5.4 had?
I get 12 hwy, 10 city but I also have 4.56 gears. When the van had 3.73 gear (and stock exterior) it did 15+ on the highway at 70 MPH. Towing ranges between 7-9 depending on speed and height of the trailer.
378,000 miles on it, still runs great with no major repairs!