Gas Is A Membership Perk, Not Just A ProductUnlike traditional gas stations, Costco has another major source of revenue: membership fees. That makes Costco gas a powerful way to get members onto its properties regularly. Costco Gas Isn't Low QualitySome drivers assume cheaper gas means lower quality, but Costco fuel meets the same federal standards as all gasoline sold in the United States. Why Costco Members Keep Coming BackThe success of Costco gas shows how the company has turned an everyday expense into a membership advantage. Ultimately, Costco gas has become more than just a cheaper place to fill up.