I have been using the Autel MaxiLink OBDII scanner to save money on car repairs and increase gas mileage.
Autel sent me this device to try out and I am very happy that I have it now. I has saved me a lot of money on mechanic repair costs and saved us 30% on our gas mileage.
I hooked this up to our car and found out that it needed some emissions parts. I immediately replaced those parts and then reset the car computer.
The car was only getting 22 MPG before but now it gets about 32 MPG since I replaced the parts. This is a huge change in mileage and a big savings on money every single time I get gas.
You can get the MaxiLink OBDII car code reader here: https://amzn.to/2Ldn7Vr