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Normal with any engine in cold weather.
Denser, colder air, has more oxygen, and thus for your O2 sensor to remain within spec, more gasoline is added. Makes more power when you need it, but simply idling or driving will use more gas.
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Richard
2013 BMW M3 Individual -- Fire Orange (sold)
2013 BMW X1 xDrive35i M-Sport -- Valencia Orange (sold)
2011 BMW 1-series M Coupe (#205/220) -- Valencia Orange (sold)
2009 BMW 135i M-Sport Coupe -- Space Grey (sold)
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