I just got back from a long trip . I got 15-16 mpg by driving 65. Anything in the 70 range and above I would drop back down to 14.2. Then I discovered a tip that if you have a SUT you have to try. Keep all your windows up along with moonroof, with the execption of the rear window leading to the truck bed. When do this and keep that rear window down I gained mpg by doing this . I can get 17-18 mpg on the highway now running 65 and no air. I am also getting a consistent 13.3 mpg now and sometimes as high as 14 depending on stop and go around town doing this. I am not sure why leaving only the rear window down is having the affect, and I know it sounds crazy, but please give it a try.
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