There are plenty of gas stations out there that happen to serve gasoline at a higher octane than 93. This is also common at race tracks. If you find yourself at one of these places, use the calculator below to figure out the correct mixture of the octanes to get to 93 octane.
Disclaimer - I've never actually mixed gasoline myself, no clue what doing it does. Do so at your own risk.
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Thanks so much for sharing! Keep them coming.