My gas mileage goes from 25 mpg to 29 mpg once we plug in The main element to the car.When your USB also gave us The three-four MPG better gasoline mileage continually, which was another confirmation that it really works. I contain the 3rd just one in my office at https://zionyuoje.onzeblog.com/32374264/the-best-side-of-best-rezotone-usb-device-for-travel