For every booking, you see the amount of kilometers including in your booking before you send a booking request. The longer the rental period, the more kilometres you get. When you book the car, you have the option to buy extra kilometres if you need to drive far. Once the rental has started, you cannot add more kilometres. Any excess kilometres will be charged at the end of the rental period. The price per overrun kilometer is 50% higher than if you bought extra kilometres before the rental period.
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