2022 Laramie 2500 6.4L Gas Stock tires: so with 4,500 miles I’m still at 9.1mpg. Most is city driving. I pull a 26’ travel trailer once a month or so and get about 8.6mpg highway. A neighbor has a 2020 PW same engine (unknow gearing) with 35” tires, raised, roll,cage, roof rack carrier, hitch mount spare tires, propane tank, fire extinguisher, shovels etc. It’s a beast! He has 40k miles on it. He showed me his average as 11.8mpg. He said I should ask the dealer to see if they can retune it somehow.
Is there anything a dealer can do to improve mpg?