2017 Shevy Silverado 5.3L

[txsendero]

Other than better performance, better throttle response, what could I expect in the way of better highway fuel mileage with 87 tune?

[mikel]

Nothing major, about 1 MPG over stock in the right conditions, theres just not that much left on the table in these applications as the EPA is forcing the OEMs to get better.

[mike1976]

i have a 2017 5.3 8 speed there is not much to do