Easy booking with EasyRent, disappointing experience with Enterprise

Good

Rented a car in Germany and Switzerland. The Enterprise rental counter at the airport was fairly easy to find. There were no lines, so the process was quick. They didn't check any translated driving license documents, just used my domestic license to get the car. However, the initial cross-border fee was high. After showing the staff the QEEQ order details, they reduced the fee by a few dozen euros (the order mentioned a capped cross-border fee). The order indicated a daily cross-border fee of 5 euros plus local tax, but the counter staff charged the maximum amount, claiming they didn't know how many days we'd be crossing the border. Is this reasonable?

No waiting in line, immediate service. The clerk said zuzuche brings in an average of 4-5 customers daily.

The car ended up costing me more than expected because they gave me a vehicle that had just under a half a tank. I complained because I know how hard it is to bring back a car with less than a full tank. I ended up filling up the vehicle and giving it back with 30% more gas than I received it. This is BS and I will never do that again, if Enterprise wont give me a car with a full tank I will not rent a car from them again.