[ROVERNET - UK] Octane VS timing
smokeandsteam at san.rr.com
Mon Jul 3 07:42:27 BST 2006
The old number was RON (Research Octane Number) and this is what the =
Co used. The other standard you would sometimes see was Motor Octane =
which was usually a few points lower than RON: the two ratings reflect
different test parameters rather than any intrinsically different ways =
measuring the fuels' resistance to knocking.
These days the US pump standard is the average Research and Motor =
California 91 "premium" gasoline is roughly 95 RON or 87 MON give or =
point or two in either number - elsewhere 93 would be about 97 RON or 89 =
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