Dan, There are delete tunes out there but do you really want to void your warrantee? You do have DEF on the truck don't you? That's not a bad system, and there are some emission legal tuners that might help MPG, but again, might have an effect on warrantee. I would bet that you are going to be around 17mpg, you've got 6 tires on the ground and your not light. The single best thing for better MPG is slow down. There is a big difference between 60mph and 70 mph, and its not as much about the gears as the fact that it takes a lot more energy to move 9,000lbs 70mph than 60mph. My 2011 with 3.73 is between 1-2mpg. You need to bring it out so I can check it out. I'll show you have to save the settings for the mirrors flipped out AND in. I am off work till the 23rd so I am home most of the time.