My 07.5 Ram 3500 was the first year with the 6.7. I drove it 90K miles before I traded it last year. Loaded, with my Arctic Fox 990 (4500 lbs wet), I got 9-11 mpg. Empty on the highway, I got about 13 or 14. Empty, in town it was back down to about 10mpg. However, at 6'9", I would definitely...