Reviewed By Scott S (Williamsville, IL) Reviewed for a 2016 GMC Sierra —10/29/2013 6:09 AM
The installation was straight forward with easy to follow directions. I'm not seeing any difference in mileage, but I can tell, by the seat of my pants, that there is improved acceleration and firmer shift points. I've calibrated with the 87 octane parameters. I may try the 89 octane calibration as I can get that fuel for the same price as the 87.