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11-12-2011 07:58 AM #1Registered Member
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Can changing the engine air filter make such a difference?
My 2005 Z4 2.5i has 25K miles. According to the OBC, lately I've been getting about 20 mpg in mostly city type driving. This is a drop in mph from around 22-23 mph. I just replaced the the filter with an OEM Mann filter and the mpg has gone up to 24-25 mph. Is this possible, or am I dreaming?
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