When returning the car, we were required to fill up the tank. After doing so, the fuel gauge still didn't show full, and they charged us without explanation. Fortunately, we noticed and went back to dispute it. We took the staff to the gas station, filled the tank again, and the gauge still showed one bar less, causing us to waste money on extra fuel, as the automatic machine didn't give change. Going back again for a refund wasted a lot of our time.