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well 5 parts 91 octane and 5 parts 100 octane yield a fuel of 95.5 octane. Remeber your 427 needed 96-98 octane back in the day.
Octane doesn't improve performance. It doesn't make your car more powerful or rev higher, faster or longer. Those are functions of cam and ignition timing. It doesn't boost cylinder pressure or compression, but it allows you to run more compression and higher cylnder pressures. Octane will let your engine live longer and not rattle apart, detonate or preignite and may allow you to make changes which will allow for performance increases
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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