In western Canada, Shell Nitro+ is the best. Costco fuel in Canada is garbage. I've tried Costco fuel in Washington and Montana and it was decent. Number 2 I would say is Esso 91 where they don't sell 94. Esso's 94 is ethanol boosted and they just blend at the pump with 87. I have yet to try the Chevron 94 ethanol free in British Columbia... maybe in February
I also have logs on gasbuddy by gas station to prove what I've found.
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