FWIW, I have gotten better mileage with my high HP McRat tunes than the lower tunes the first time I ever broke 18mpg (2WD, summer tires, #2) was the race tune.
I have even gotten 0.4mpg more in 4WD with my new HTT and the corresponding McRat tune in commuter traffic which runs about 70 mph max with lots of surging up and down.
My wife was not impressed with the increased mileage, she asked if I upgraded the turbo for mileage
. I said no, it was an unintended consequence of adding the turbo....she already knows about the first half tank that was at 7.5mpg (in 4WD) with the new turbo
. Man is that thing cool.:angel: