Bought 2 of these after the 5.3L in my '08 Tahoe dropped 2 cylinders at 147K miles. Stuck them in my Tahoe (after a new engine) and '14 Silverado to make sure I don't have problems in the future. Maybe slight decrease in fuel economy, but doesn't appear to be much. Provides some peace of mind which makes it worth it for me.
Very glad I got it!
Hardest part of installation is running wires and stuff. Bought this tuner after reading reviews on others.Bully Tech support is very helpful! Installed performance tune and drove to work for a week. MPG went from 17 to 20! Installed tow tune and pulled my 5800 lb travel trailer with full water tank.Tow MPG went from 9 to 13 and went faster up the hills with less downshifting! The driving coach takes a few drives to get used to but not a biggie!
I am pleased with the way this device works. I have had no problems with it as some other people have. I can feel the difference in performance. I check fuel mileage towing a small trailer with 2 rolls of hay and 20 bails of hay. I averaged 13 mpg. With the ac running all the time. I have let the Tahoe sit for a couple of days with no problem starting. I will unplug if not running it for a week. I've only had it for a couple of weeks. So far so good. Worth the money in my opinion.