One of the interesting things about my truck is that the previous owner never reset the fuel used counter and now it is about to surpass 8,000 gallons. The mileage just rolled past 120,000. When purchased in May, the lifetime fuel economy average by doing the math was 15.4 mph and now it is 15.04; getting worse with me! Now I reckon those West Virginia hills helped the mileage as well as the cooler weather, I've never seen 18 mpg (an average lasting a tank full of gas) at any time since bringing it home from North Carolina. Just completed a 1,200 mile trip and it's average fuel economy, fully loaded mind you, sits at 15.6 mpg. In every other automobile owned, surpassing the mileage on the window sticker was easy, but not so with this truck! Maybe that's because the mileage on the window sticker was blank? LOL Published literature puts it between 14 and 15 city and 19 to 21 highway. Do they get better mileage above 78 mph? I have a Montana that gets its best mileage at highway speeds that would make the driver well deserving of a ticket!