Actually respdoc & rob m are both right, current fuels have little to do with brand names and are greatly influenced by the refinery they were produced in, the tanks they were stored and transported in, and the age and condition of the underground tanks in the station from which we buy them. If it makes you feel better to purchase fuel from a particular supplier that's fine. Personally I buy from the lowest cost supplier with the newest station, because I know that gas bought on the spot market and pumped through a newer station with the lowest price in the area, will get a higher throughput and therefore have less chance to get contaminated.