04-01-2010, 07:43 PM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I remember hearing that unless you are using the 92/93 octane within a few weeks that it actually declines in octane. If your fuel is sitting in the tank any longer than this you may consider running the medium grade fuel. I'm not a chemist, this came from a meeting held by one of the local oil/fuel companies.
With the economy the way it has been, most people I know have stepped down a grade in their daily drivers. I would guess this is pretty common across the board.
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ERA FIA 2088
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