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FWIW, I've been using Costco gas (91 is all we get in Nebraska) since 2014 or whenever the local Costco opened.
I filled up 3 days ago, no problems. Not to say the gas is the same here as up where you are. I do have a L99 that has lower compression than you however.
Wondering if the transport put 87 in their 91 underground tank?
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