Just been out for a drive in my 3.0d M-sport - only did a short five miles and averaged 49.4 MPG from cold in ECO mode. I reset the trip computer mid way through the drive and it was registering 54.3MPG at one point and settled at 52.4 MPG. Its 2.0C here so very cold so not bad. I have only had the car a week and it has done 484 miles so far.
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2013 X3 M-sport Deep Sea Blue, Black Leather, Xenons, DIRAC Professional Sound sytem, Pro Nav, 19" Wheels, Tinted windows, Folding Mirrors, PDC, ASS, DAB Radio, Aluminium trim inc roof bars