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      11-18-2012, 03:25 AM   #41
Rshane
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Drives: 2011 E92 M3
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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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