Reviewed By Richard C (Temple, TX) Reviewed for a 2002 GMC Sierra —3/16/2013 7:35 PM
This programmer really "wakes" my Duramax up! The Extreme setting gives you the performance. Tow mode allowed me to pull my 35' 5th wheel TT at 75 - 80 with out a strain, getting 10+ per gallon. Enconomy mode boosts mileage an easy 5 to the gallon, if you can keep from playing with the wanna bees, cause even the economy mode wakes the engine up! Making this purchase was one of the best automotive moves I've made since I bought the truck in '02.