Fuel retailers must meet the high TOP TIER standards with all grades of Fuel to be approved by the automakers as providing TOP TIER Detergent Fuel. In addition, all Fuel outlets carrying the brand of the approved retailer must meet the TOP TIER standards. Additional Fuel retailers are added to the TOP TIER list as they meet the standards. The retailers known to be on the TOP TIER list are shown below. TOP TIER Fuel Retailers: QuikTripChevronConocoPhillips76ShellEntec StationsMFA Oil CompanyKwik Trip/Kwik StarThe Somerset Refinery, Inc.Chevron-CanadaAloha PetroleumTri-Par Oil CompanyShell-CanadaTexacoPetro-CanadaSunoco-Canada News source: Feather Petro