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      01-19-2013, 12:06 PM   #45
FogCityM3
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Drives: M3 (E90)
Join Date: Feb 2012
Location: San Francisco

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Saves approx 1 mpg and my driving is 25/75% city/hwy. It sometimes may flip back on if the battery isn't fully charged...I suspect this may have to do with the fact that I have a crank pulley (may not be fully running alternator), so I just keep the feature turned off.