The wife and me just completed our little vacation to the Smokies, round trip 1439 miles, avg. mpg, 13.3 with a high of 13.7 and low of 12.5. 108.1 gal. of fuel. Speed of 60-63 avg., with a stretch of some 65 mph in there. This with my 3300 lbs. camper in the bed. This is a little better than the early '99 I had. Of course I drove a little faster with it. Wonder if a DP-Tuner would help a little.