Thread: Octane rating..Circa1970
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Old 02-11-2007, 04:15 PM
COPO COPO is offline
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Default Re: Octane rating..Circa1970
The way octane is measured has changed over time. Today's R+M/2 which is the average of the research octane + motor octane differs from the good ole days so it is not an apples and apples comparison.
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