Quote:
Originally Posted by DIGItonium
Kill half the tank and go back to fill up with 91/93?
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But I would use at least 93 octane. When mixing octanes of equal volume the resulting octane mix an average of the 2.
Example: 9 gallons of 87 octane + 9 gallons of 93 octane = 18 gallons of 90 octane