higher Octane = Better MPG
i averaged 2.9 more MPG using 93 R+M/2 octane vs 87 per a (2011) 1100 mile MPG compar-o. in addition,(2010) i got similar results from a 3000 mile 87, 89, 93 octane MPG compar-o. as per the higher the octane the better the MPG.
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