In my M340 the best I've achieved on my 17 km comment to work was quite surprising to me for such a powerful car:
5.1 Litres/100km (46.1 U.S. mpg or 55.4 U.K. mpg)
But because I like to put my foot down I'm currently at:
9.2 Litres/100km (25.6 U.S. mpg or 30.7 U.K. mpg)
which is still a bit better than my wife's X3 30i... so I'm pretty impressed.
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