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[hpprose]

There are quite a few different things that can affect mileage.
Height of the vehicle -- You have a 2” lift
2wd vs 4wd -- I’m assuming you have a 4wd
gear and tires -- your gears and tires look good for mpg
speed at which you drive ? are you staying out of the turbo (less than 2,000rpm?)
rate of acceleration (are you a lead foot) – Briskly accelerating will yield the best fuel economy according to a couple manufactures. Problem is, what does “briskly” mean? To me, its ¾ pedal.

Your truck might not be broke in yet.

Another thing, when the fuel stations switched to Ultra Low Sulfur, our mileage dropped. Some people droped a couple miles and others dropped only tenths. Varies by vehicle.

There are a few different things you can do to improve your fuel economy.
Adding a chip. Quadzilla’s chips will improve your mpg by 2 to 4
Adding a tonneau cover. Should also yield about 20% increase
Switching to a quality synthetic like Royal Purple will also help. I switched the engine, transfer case, and both differentials and gain 2 mpg
Also driving 65 or less should yield a much higher mpg. Unlike a gasoline engine, our diesels are very sensitive about what rpm they run at. Lower is better.