I just did a road trip last weekend of about 800 miles. I got 20.04 mpg with a 4 wheeler, dirtbike, heavy toolbox, cab full of gear, and a passenger. 254,000 miles on the engine. 21.5 unloaded. Course I keep it at about 1850rpms. Somewhere above 1900 the turbo really kicks in and your milage takes a dump. (no boost guage yet, waiting for engine to break in first) My milage went up when I straight piped it a month ago. From the DP back.