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happycamper · 03-08-2011, 02:55 PM

I've been doing some careful comparisons of 85 vs 87 octane lately (87 is mid-grade where we live).

So far, I see no fuel economy advantage using 87, and I haven't noticed any more power either.

03-08-2011, 02:55 PM	#4
happycamper Drives: 2012 2SS/RS M6 AGM Join Date: Jan 2011 Location: Colorado Posts: 221	I've been doing some careful comparisons of 85 vs 87 octane lately (87 is mid-grade where we live). So far, I see no fuel economy advantage using 87, and I haven't noticed any more power either.