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Originally Posted by Lethedethius
Are there any obd2 scanners that can change the fuel settings?
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You may not actually want to tune specifically for less power... Leaning it out a little will often increase power a bit. Maybe something like Black Bear Performance tunes might be what you are looking for:
Black Bear Performance :: Custom Tuning Solutions for 96 and newer GM Vehicles
Not sure if they do V6s though. I was considering this with my Silverado before I gave up on it and bought the Civic. Blackbear also turns on the ability to use an electric fan and sells a harness for that. The e-fan mod should bump your mileage up a little too.
There are also devices like Superchip, Hypertech, and Diablo that are more DIY, but still pretty pricey.