I didn't buy this truck to get great mileage, if I were concerned with MPG then I would've bought a Prius... but I'm impressed with the mileage that this thing gets when not pulling a load. Also, when I tell people that I get 20+ mpg on the highway no one would believe me, so I made a video... Vehicle is crew cab, short-bed, has leveling kit, 35" mud tires and is 4x4 with 3.55 gear ratio. Mileage is pretty accurate when compared to hand calculating. Upgrades are def/dpf/egr delete and h&s xrt pro (programmer was set on "street" mode). Has been modified since new, never had any problems with it. Cruise control was set @ 70 mph driving through the mountains of West Virginia during a recent 1,600 mile trip.