How do you ensure that the gasoline that you purchase is the best quality?

Big.J.007 said

I get 90 octane non ethanol at QT Gas Station. Most Walmart Gas stations have non ethanol as well... but that gas is a Crapshoot.

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It’s called “super clear” or non ethonal, in the Portland metro. I know of about 10 stations in the area. Also stations close to a boat launch. Are good to look at.