Well it's too early to tell about the mileage, I've only put 100 miles on it since the upgrade, but I can say there is a noticable difference in the overall performance of my H3. I really noticed this morning on the way to the dump. My trailer alone is 1,700 lbs plus a washer/dryer, 2 full large trash cans and
a lot of dog poop. I was surprised at how fast I was going and how quickly I got there. I can't say anything more than what has already been said. The PCM upgrade has been well worth the money. It's a shame GM can't program them like this from the start. I know why and I understand.
You can add me to the list of happy PCM for less customers.
Mileage update coming soon...............
