Reviewed By Michael M (Marion, IN) Reviewed for a 2014 GMC Sierra —3/16/2018 6:20 AM
Worked just as advertised. Very happy with it.
Reviewed By Donald E (Gilbert, AZ) Reviewed for a 2011 GMC Sierra —2/27/2018 8:23 PM
Bought this to turn off AFM. Only tried fuel save flash with AFM disable, and MPG has decreased slightly. Have always had good mileage as I drive with light foot. Mostly stop/go so far, so jury is still out on highway MPG...