89 or 91 octane - '91 300CE - PeachParts Mercedes-Benz Forum

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89 or 91 octane - '91 300CE

05-13-2010, 08:04 PM

rgnprof

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Join Date: Feb 2003

Location: Oklahoma

Posts: 1,081

89 or 91 octane - '91 300CE

Is there that much difference? I have always used 91, but it was $2.97 today (no ethanol), and $2.49 for 89 (10% Ethanol).

I know the manual says "premium", but is anyone else running 89?

Thanks, Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

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