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6. What do Fuel Octane ratings really indicate

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Subject: 6. What do Fuel Octane ratings really indicate
From: "Mike Winney" <>
Date: Sat, 16 Jun 2001 14:20:01 -0700

This link was on the VW Passat list and gives a very through and technical
explanation of combustion parameters.  The below copied paragraph is
important to MG owners especially those of us who regularly drive in widely
varying altitudes, i.e., mountains of Arizona (7,000' to desert floor 3,000'
or less)

---On modern engines with sophisticated engine management systems, the
can operate efficiently on fuels of a wider range of octane rating, but
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the

Mike Winney
68 MGB GT (Restoration Complete)

[demime removed a uuencoded section named 6. which was 7 lines]

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