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      11-16-2012, 07:32 PM   #24
First Lieutenant
Drives: 2011 M3 E92
Join Date: Jan 2011
Location: SE PA

Posts: 335
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Octane alone will not have much, if any, effect on MPG. You would notice more of a difference in performance and/or knocking of the engine.

You paid $4.15/gal in NJ? Boy are the goudging!! I paid $3.79 for my last fill in PA where we generally pay much more than NJ.
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