Tuner for Avalanche
 

Would I notice anything? If so, which one? The truck is stock and will remain so, don't want loose reliability. Any thoughts.....the truck has 40,xxx miles and runs great, gets 17mpg.:)

Prolly be better off with a Blackbear tune or something of the sort.

What my Diablosport Predator gave me in increased mileage isn't worth mentioning.

They're a great diagnostic tool, for adjusting parameters and reading and clearing trouble codes, but nauticastar87's right,getting a tune would be a better deal for less money.