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Message: <blockquote data-quote="TulsaMike" data-source="post: 4213536" data-attributes="member: 49625"><p>Fuel trims can compensate plus or minus 25%, so the 10% ethanol really doesn’t cause any harm other than slightly reduced mileage (very slightly). If your car is setup for 91, it will run better, but often if it “can” run on 87, the timing isn’t super aggressive so there may be minimal gains unless it’s a newer mustang that has the better knock sensors and can actually add timing for octane.</p></blockquote><p></p>