Quote:
Originally Posted by Ciao
We do not have less oxygen; we can breathe, we have reduced air pressure.
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Which results in less oxygen, by volume, in the cylinder. ;-)
You're both right. But ultimately it's the cylinder pressure which, as it increases, requires a higher octane (resistance to detonation). Thus: lower air density=less cylinder-fill=lower cylinder pressures = lower octane requirement.
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