So do a test, use it for a tank of gas then turn it off for a tank of gas, keep track of your mileage then report back. I highly doubt its worth the time.Thought I was the only one that appreciated having it on my truck. If you are able to get it working look into the start/stop eliminator dongle. It keeps the switch in whatever mode you had it in and doesn’t reset to on every time the truck is started. I keep mine off and turn it on in heavy traffic or when stopped for some reason.