Renters pay for the fuel by returning the car with the same amount of fuel as you gave to them at the beginning of the booking. You record the fuel level during check-in and check-out. Agreements concerning fuel and payment are settled amongst renter and car owner.
We advise that you, as owner, provide a full tank and the renter returns the car with a full tank as well. This is the easiest way to handle this.
If the car comes back with a different amount of fuel than it left with, you look for a solution together. You can settle deviations with extra kilometers driven, by means of cash payment or with a digital payment request at the end of the rental period.
Note: Make sure you have an agreement with the renter on this topic before handing over the keys.