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      02-04-2013, 05:19 PM   #5
Bibendum
Private First Class
 
Drives: 2013 M5
Join Date: Dec 2012
Location: Los Angeles, CA

Posts: 128
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Have same thing. Was driving the other day on new asphalt with no radio and heard sound stop about a second after let off gas. Figured it was a pump of some sort disconnecting when I went into "coast" mode. Might also be the "efficient dynamics"?
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