Reviewed By David B (Lockport, NY) Reviewed for a 2009 Hummer H3 —3/30/2015 12:08 PM
Saw a 30 mile increase with the first tank of fuel...it will pay for itself in 6 months...better fuel economy with greater performance!!!
Reviewed By Shawn J (CLOVIS, CA) Reviewed for a 2008 Hummer H3 —8/13/2014 11:57 PM
I wanted something that I could program myself instead of sending of my PMC to someone eles to program. I was able to change my tire size to compensate for the 33in tire I installed, also was able to change my shift point and shift firmness as well. It also came with two performance setting, an 87 and a 91 octane. I used the 87 octane in my 3.7 liter and I got a boost in performance and mileage as well. Which made me very happy.
Reviewed By THOMAS B (Rockaway Park, NY) Reviewed for a 2008 Hummer H3 —7/29/2014 5:06 AM
I had purchased other brands before for different cars and they were not that great so I was skeptical. I am very happy with the boost in performance this gave to my H3 5.3L V8. It has a much more responsive feel with firmer shifts which I like. So far I've only had time for the 87 Octance Performance Tune but I want to give it some testing time. Not only is performance better but it added 1/2 MPG to my average at the same time. Can't wait to try the other features.