The rental company required a full tank upon return, so I found a gas station at Amsterdam Airport and filled up. It was less than 1 kilometer to the drop-off point. The attendant quickly processed the return, and since I was in a hurry to catch my flight, I didn't scrutinize the bill. It wasn't until I was on the plane that I noticed a 79-euro fuel charge on the bill. Back home, it took countless phone calls to find the right person. They requested a receipt for the fuel, which luckily I hadn't thrown away, so I emailed a photo of it. I thought the issue was resolved, but then I received an email saying that their records showed they added 7.5 liters of fuel at 2.99 euros per liter plus a 12-euro service fee, so they could only refund 44 euros. Upon reflection, I realized this didn't add up. If there’s a post-return fuel check process, then charging 79 euros at the time of billing wasn't a mistake but an intentional overcharge. Furthermore, if it's 2.99 euros per liter plus a 12-euro fee, 79 euros would only cover about 30 liters. This pricing method is clearly misleading. If I returned the car empty, would they end up losing money?