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A number relating to the ignition temperature of gasoline in a combustion chamber.

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Here in Colorado, gas stations sell "regular" gasoline which is rated at 85 octane ((M+R)/2). In most of the rest of the US, 87 octane is the lowest grade available. (As noted previously, higher … octane fuel can withstand higher compression without detonation.) According to this article from AAA, the stated reason is that most of Colorado is at high elevation, above 5000 feet (about 1500 meters …
asked Aug 21 '13 by Nate Eldredge