Most vehicle suppliers will supply the car with a full tank of fuel. To avoid incurring fuel charges you will need to return it full.
You may also be required to leave a fuel deposit reserved on your credit card that will be released when you return the car full. Missing fuel will be charged on your return. The price per litre charged by the rental agent may be significantly higher than the price at the local service station, so please try and fill up before returning the vehicle it saves you money !
Note: Most fuel charges are payable at the rental desk unless otherwise stated in the Included in the price section, so do check your terms and conditions.