4 cylinder you mean? Air con will eat a couple, but if you have the 28i (4 cyl), you're getting horrible mileage.
More info is needed, but if it continues and you're still under warranty, bring it in and have them look at it.
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2011 E91
2016 M2 - Sold
2014 X1 - Sold
2002 Land Rover Discovery II - 3" lift & 33s
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