I had about four bars on my fuel gauge and was thinking about refueling. I was visiting a relative and left the car parked facing uphill ona steep incline for a couple of hours. When I got back in the car to head home, my fuel gauge was up to one bar below full and the miles traveled was reset. I KNOW I did not refuel. I have only driven a few miles since, but am concerned about the accuracy of the gas gauge -- and how did it reset itself????