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Old 12-20-2009, 03:52 PM   #3
Isis07
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Join Date: Apr 2008
Location: Stafford VA
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As Mohaughn said, it's possible for the OBC to be wrong. I'd make sure you're actually getting mileage that low before spending money on replacement parts.

The OBC has a formula for calculating mpg that can be adjusted as seen in the following link.

http://forums.bimmerforums.com/forum....php?t=1280417
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