Always, always, always take an odometer and fuel level photo at pickup and dropoff. If you have time, take a walkaround video at pickup and dropoff. You don’t even have to get closeups, just walk slowly and take a good overview, including wheels and roof/hood.
One rental, Europcar recorded that I brought in the car with only 1/2 tank of gas, and they charged me a convenience fee and exorbitant €/L rate. It ended up being close to 150€. After many calls and sending proof, they finally removed it. If you chargeback, there’s a good chance you’ll be banned, so use that as a last resort.
