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I have been using Costco gasoline for years. But that may become history. When you installed the gasoline additives and advertised Clean Power I was hoping that Costco would be added the national "TopTierGas.com" list of high quality suppliers. But alas you have not as of today. When will you achieve that standing to be on the Top Tier Gas list. The dealer of my car service department told me to not use Costco gasoline as it will damage the engine.