gas mileage gains on 08 6.4

[robbydiesel]

what gas mileage gains are are you seeing with the predator vs. stock. i have gone from 11.9 city to 14.5-14.9 normal driving. but, on the interstate i also only get 14.5-14.9. this is on the 80 horse program, which gives me the best in town. please tell me what your #'s are? my truck is bone stock.

[armentrout2]

Too early to tell, but mine reports about the same. Highway reports a little higher, but the computer is not accurate anyway. I 'll know when I top off again.

[lighthouse37]

Ditto. With Performance, I got nearly a gain of 5 (12.5 to 17+) on highway but again, based on computer so not accurate, also since I have been playing with so many settings plus went to 37" tires recently. Now that I am settled in, I will start doing manual calcs...