I think it is kind of silly to worry about fuel quality at Costco or a major supermarket chain. They are about the LAST places that I would fear. They are professionally managed and jealous of their reputations. It is like the people who say "I would never buy oil (or DEF fluid) from Walmart." There is no reason on earth for such places to sell sub-standard products. They have brands to protect. It is the no-name garages that you have to worry about.
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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