>> The energy content, and hence mpg, of pure gasoline (no ethanol added) is the same for all octane ratings. The higher octanes are designed, and only needed, to prevent "knock", or pre-ignition.
>>
>> E10 (10% ethanol, 90% gasoline) has about 3-4% less energy per gallon, and will slightly lower your mpg.
>
> higher octane has a lower flame rating I think, runs cooler
I don't know about actual *burn* temperature once ignited, but lower octane is easier to ignite, which is why it is not unusual for high-compression engines to require higher octane.
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Jim Saklad mailto:jimdoc@icloud.com
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