Reviewed By Jason B (Flowood, MS) Reviewed for a 2014 GMC Sierra —2/21/2017 8:11 PM
I used the tuner to adjust my speedometer for larger tires I put on my truck. That plus the fuel saving setting increased my mpg by almost 20%. I haven't had time to play around with the other settings yet. It's very easy to use. The whole process including reading instructions took about 10 mins.