The gasoline we bought in the good ol' days with "100+ octane" was rated
by different methods, Research Octane Number [RON] or Motor Octane Number
[MON]. Gasoline is now rated by averaging these two ratings [R+M/2].
There are several good gasoline articles on the web for those less
technologically challenged than I, such as www.faqs.org/faqs/autos/gasoline-faq/part1/
--Roger van Hoy, '55 DeSoto, '58 DeSoto, '42 DeSoto, '66 Plymouth, '81
Imperial, Washougal, WA
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