[psiperformance]

if you lost 5 mpg it aint from the tune its cause your driving the car hard because you like the power

there is no reason at all to lose any part throttle highway mpg from a tune as wot and part throttle tables are two totaly different things you will lose a little in town mpg due to the shapening of the drive by wire tables but 5 ? no way unless something was done wrong in the tune