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      11-18-2012, 04:25 AM   #41
Rshane
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Drives: 2011 E92 M3
Join Date: Jul 2010
Location: San Antonio, Texas

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Doesn't sound like an octane problem but, an Ethenol problem. Octane won't affect your mileage much however, Ethenol will. Ethenol has a much lower energy rating, meaning it takes more to make the same power.
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2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust

2012 Le Mans Blue 135i M Pkg DCT
2013 Ford F150 FX4 Supercrew