Reviewed By Joshua M (MISSOULA, MT) Reviewed for a 2007 Chevy Avalanche —3/9/2011 11:31 AM
the main difference you can expect to see is a big improvement in how the truck shifts. i installed the tuner in my 03 chevy 5.3L with the premium fuel option to gain the most results i also bought the programmer to change my speedometer for 35s. i have increased mileage about 2 or so with aggresive driving. good product i would buy again.