Looks like my local Costco got a load of E-85 and put it in the regular tank. I'm sure they'll make it right for the people that had issues and should be easy enough to verify since a Costco card is required to pump. I get premium here now that they've expanded to 22 pumps from the 12 or so they had before.
https://www.ksdk.com/mobile/article.../63-d4833372-bffd-4206-8f2e-b30c038aa1be
https://www.ksdk.com/mobile/article.../63-d4833372-bffd-4206-8f2e-b30c038aa1be