[HUMMERICH23]

I average 14-15mpg easy in my 08 H2. Right now my cpu reads 14.0 mpg with a range of 448 miles when i fill up. During winter I usually drop down to 12.5-13 easy. I have gotten 18 +mpg Highway easy especially when doing the speed limit. If I go 55-60 i get 18.5-19ish, 65-70 i get 17ish, 70-75 i get 15-16mpg. At 80 it is terrible, drops to 13-14. I do mixed city highway and it’s my daily driver. i haven’t reset my mpg avg since spring and like I said its at 14.0

Have you reset you avg mpg by holding check mark button down after you have gotten to cruising speed and see what is says? Try that doing different speeds to see what your truck is capable of. I know you prob can’t go any speed below 75-80 since you’re in socal but if you could try it doing 60-65, 65-70, etc. I absolutely love my 08 with the 6.2 and 6speed and wouldn’t have it any other way.

p.s. I do have Air Intake, Performance Exhaust, and CPU Tune mods. I have had those since pretty much it was brand new so I can’t comment on how it runs without those mods (sorry). I only use 93 octane and in general the 6.2L runs much much better with premium
(most of the numbers too i gave you are on flat straights, not many hills or mountains around here)