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I think the attendant was slightly misinformed. All Costco stations mix in their detergents on-site. Here's Costco's own article about it:
https://www.costcoauto.com/automotive_articles/fuel_economy/top_tier_gas_nozip.aspx
https://www.costcoauto.com/automotive_articles/fuel_economy/top_tier_gas_nozip.aspx
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