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Originally Posted by Elk
A higher octane rating means the fuel is more resistant to combustion
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you're half-right on that comment...a higher octane rating doesn't mean it's more resistant to combustion..if it was..then the higher the octane the harder it would be to make a car run.....the higher the octane rating means it's more resistant to SELF-combustion...igniting itself from the heat and pressure inside a cylinder. that's why higher performance cars use it becuase they tend to run harder and closer tolerances. if you ran a high-performance car on 87 octane, it would probably knock and ping quite nicely, somewhat to the sound of a horrible orchestra. but running a higher octane won't give you any more "performance". your car isn't going to suddenly be able to burn the tires for blocks and blocks.
to get a car to run on a higher octane, you need a hotter sparkplug to ignite the higher self-combustion rating. now i'm not an expert on e-85 so don't go start filling up with e-85 and just throw in some hotter spark plugs and think it's gonna work because i have no idea if it will....i just wanted to clear things up a little bit.