Risk glossary

 

Octane

An octane number or octane rating is a value used to indicate the resistance of a motor fuel to knock (ping). Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock). For example, a gasoline with an octane number of 92 has the same knock as a mixture of 92% isooctane and 8% heptane.

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