That is really good mpg coming from a truck and on top of that, using the A/C and having more alternator draw than usual. Congrats!
If I may dissuade you from not modding... aero mods would do wonders on your truck. It has a higher coefficient of drag (Cd) than most cars and would see improvements better than an already "slick" car. I personally noticed a difference in acceleration and coasting starting at
25 mph and above. I have lowered my aero drag enough that I can avoid drafting semis and go my own pace.
Also, if you had coasted down hills in N (Engine On), you might have added more than 1 or 2 mpgs to your highest average. Just some food for thought
