the way octane is figured it would technically be a percentage wouldn't it? ((R+M)/2.)
also found
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Octane number is the number which gives the percentage, by volume, of iso-octane in a mixture of iso-octane and normal heptane, that would have the same anti-knocking capacity as the fuel which is under consideration. For example, gasoline with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90. [1]
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Steve
'97 GTP VS cam, ZZP PCM, and not much else yet