I just did the DPF, EGR, and cooler deletes. XRT Pro on the mild tune. First run was from Miami to St Pete with some headwind from a front. 258 miles all highway 77mph and I still only got 15.5 mpg. Does it take a while for the mpg's to come up? Truck is an 08 4X4 four door longbed dually. It does now have a LOT more power even though its just on the mild tune.