There is no obligation for you to refuel a Pony. However, in case you need to refuel, you will find a tank card in the glove compartment next to the key. You can use this at all OMV/Petrom petrol stations. Please only refuel the car with Super 95.
You can only refuel if the tank is less than 25 percent full before refueling, you will get 20 free units in your account as a reward for your time (with a maximum of once per rental period).