2011 Colorado 5.3 V8
Seems to work well. It is still a little early to be able to tell. Instalation was easy. I could tell a difference between the different types of tunes. The milage that I was getting on the highway was terrific to start with and I haven't had a chance to go on a road trip since changing the tune. Around town it is so hard to tell because of all the various conditions.
Upgrade inboard PCM at dealership before use
got device, plugged it up with excitement only to find it wouldn't work. Called tech support and found out my truck needed updating before I could use. Finally installed but was hoping to correct speedometer due to tire size, still 2.5 mph off. Everything else works as it should now.