I have this tuner for my 3.6 JKU and run it on diablo tune all the time, I notice a difference climbing hills in 5th gear cause I run 315/75R16s with 3.21 and 6spd. I make the same 2.5hr commute each month for supplies and even set on diablo tune, I get ALMOST an extra 100km on a tank of fuel. I recently drove from red lake to Winnipeg which was roughly 490km on 3/4 of tank of gas! That's awesome for a jeep unlimited with 4.5" of lift and 35s. I'm pleased with my tuner.
Sent from my iPhone while driving!