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Using Shell 91 V-Power 90% of the time, it is a recommended one.
Tried Costco 91 and honestly do not see much performance difference.
Also reading up on Costco quality, it is ethanol free and probably drawn from the same refinery.
I'm not 100% sure on Costco, and I do not drive as much due to work from home, price difference is not an issue at this time.
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