The Octane reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Octane

Octane is an organic chemical, specifically an alkane, with formula C₈H₁₈. (8 carbon alkene). It is the major constituent of petrol (US:gasoline).

Octane ratings are ratings used to represent the anti-knock performance of petrol by giving the percentage of octane in an octane-heptane mixture that would have the same performance.

See also: cetane in diesel.

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