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What is the octane number for isooctane?

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Wiki User
08/19/2012

Iso-octane (2,2,4-Trimethylpentane) is the isomer that is the standard for the 100 point octane rating scale (the zero point is n-heptane). Higher octane numbers are now possible

through additives, but 100 percent iso-octane has the rating of 100.