Has anyone use the H&S Mini Max tuner on thier 2010 Cummins? I want to chip my truck for fuel mileage. I don't care so much about power and I don't want to mess with my warrantee by removing the DPF or EGR. What kind of mileage increases can I expect with an H&S tuner, or any others for that matter. I'd like to hear actual expieriences, not what someone heard. My truck is a 2010 crewcab 4x4 with 35" tires. 2.5" front leveling kit, but stock otherwise. I now get about 14-15 mpg on the highway at 75 mph. Thanx, WILDMAN