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Message: <blockquote data-quote="DPI" data-source="post: 2090396" data-attributes="member: 793">Another issue with octane I didn't see mentioned is the mix of gasoline vs ethanol to get to a specified octane.  For example, QT purchases low octane gasoline and adds the maximum amount of ethanol (10%) to get to 87 octane.  This benefits in lower costs for gasoline and more subsidy reimbursement with the ethanol.  Not all retailers do this, but I know QT did through 2012.  Other retailers would purchase 87 octane and then add 10% ethanol and the end user was getting a higher octane than they were paying for.  I do not put ethanol in any of my vehicles or equipment.Because ethanol has an octane rating of 113, adding 10% ethanol to gasoline raises the finished fuel's octane rating by 2 or 3 points, improving the fuel's performance.</blockquote>