2014 6.2 SuperCrew
with Roush supercharger, JDM650 tune
37" BFG KO2
added pounds from bumpers, winch, stereo, skidplates, etc
91 gas
I live at 6900 feet elevation
Getting 11.4 MPG on the dashboard, with the tune corrected for tire size.
When all I had were the 37" tires, but no supercharger, no...