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      01-12-2013, 07:33 PM   #7
thenewrick
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Drives: 2007 E93 335i Black Sapphire
Join Date: Dec 2012
Location: USA

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Ethanol is used to increase effective octane rating. In turbo cars it's especially noticeable. You can run more boost and advance timings as well as produce less heat while increasing exhaust volume(faster turbo spool).