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Car noob, but I understand a higher octane combusts at a higher energy and thus endures higher compression ratios (more power), correct? This is why high-performance engines need them. So, say my Volt suffers from afterfire on 87 (10% ethanol) gas. If I ran 89 or even 91, afterfire should be less likely, correct? I'm assuming the afterfire means unburnt fuel is making it to the exhaust and when it meets a hot element it produces the afterfire BANG effect. If 89+ fuel was used, would this be more difficult to ignite along the exhaust route, especially with lower pressure?
 
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