Reviewed By Guy S (Sneads Ferry, NC) Reviewed for a 2011 GMC Sierra —11/7/2014 9:02 AM
I have a GMC Sierra, 2011 5.3L vehicle... This item roughly increased my MPG from 17 to 19.5 for both highway and city use. Now I was really concervative with my driving, if your punching the gas pedal your not going to get close to that. The system did change the shifting of my vehicle, I notice an improvement of shifting and responsiveness, the only problem I had with this was a faulty cable upon purchase. I called and a replacement was sent to me automatically free of charge! Good service!