We had to wait almost two hours at the airport before the rental company came to pick us up, thanks to QEEQ for helping us contact them; before returning the car, we encountered an issue with the fuel gauge. The second last day, we filled up the tank (the pump automatically stopped), and after driving only around 20km the next day, one bar (out of 8) on the fuel gauge dropped. On the day we picked up the car, we drove at least 50km. Before returning the car, we decided to add 50 RMB worth of fuel to top it up, but it kept requiring more fuel. We added 50 RMB worth of fuel five times, and fuel was overflowing from the tank, but the gauge still showed only 7 bars (it requires full tank when picking up and returning the car). When we arrived at the rental office, it still showed 7 bars. After handing over the keys, the staff started the car, and the fuel gauge suddenly showed full. This was very suspicious, and when we pointed it out, the staff hurriedly drove the car away. We strongly suspect some tampering had occurred.