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      09-21-2009, 09:12 AM   #25
dgbos
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Drives: 2015 M5 BSM CP
Join Date: May 2009
Location: Boston

iTrader: (0)

Mine also seems to be getting worse and I have an aftermarket air filter. I average ~15.5 and 190 miles per tank. That being said I find it difficult to not stomp on the gas frequently so I guess it is worth it!