Gasoline is sold in litters and you will want to fill the car up before you return it to the rental agency. No gas station, none that we found, seems to accept gasoline credit cards so leave those gasoline credit cards at home. There are Sol, Texaco, Cadisco (sp), Gess, Best Gas and probably other gasoline stations on the island. I find the Cadisco near Orient Beach to be the cheapest. They normally sell it in Euro’s but they accept $1= 1 Euro. There is a Sol and Texaco station just below the airport where you can fill up, before returning the car, but they are expensive.