This fuel saver is no joke! I work on cars all the time and when I saw this device, I just had to try it out for myself. This little chip reads transmission codes and does a full analysis of the engine. After installing it and while driving for about 125 miles, it continuously processes engine readouts to understand your driving behavior. After it has collected enough data, this genius chip starts making small tweaks to the ECU, which is like the main computer controlling your car’s engine. I didn’t expect this chip to do much about fuel efficiency but after 4 weeks, it has almost paid for itself! So I bought another for my wife’s car with the same fuel-saving effect! My advice... get this while you still can because it’s probably going to be banned soon.