MPG Improvement

[Morgoth]

Hey guys. I have a 2004 GMC Sierra 2500HD with the 8.1 Vortec and Allison 5 speed tranny.I've put a ram-air intake and flowmaster exhaust on my truck,seeing MPG go up 2.5-3 MPG(15.5-16).How much more MPG can I expect to gain by using the Predator? Thanks

[mikel]

You can expect 1-2 more MPG from highway driving with the Predator tune.

Thanks

[S10HotRod]

Mine went from 15.2ish to a little over 17mpg.

On the street. Don't have a hwy mpg.

[06MonteSS]

and once you get your fueling dialed in, you can expect another 2 mpg increase as well....