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      01-24-2013, 10:40 AM   #3
eric@helix
 
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Drives: 01 M Coupe, 08 135i, '12 328i
Join Date: Jul 2007
Location: Philadelphia

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I find that all tuning devices decrease mileage at lest at first because of the way people drive their cars after getting them. It's human nature: step on it and feel the torque.
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