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FWIW, during my European Delivery, I averaged 17.8 MPG (12.58 L/KM according to one online converter), with a mix of driving (Munich to the Neuschwanstein castle & back, then Munich to Nürburg, including two laps on the 'Ring) and back. I did plenty of city driving, and hit a couple of epic traffic jams, but a lot of time it was with the cruise set at 120 - 130 MPH, and one full-throttle blast at an indicated 160 MPH.
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 2014 F10 M5
Previously...
Threes: '08 E90 M3, '07 E92 335i,
Fives: '11 F10 550i, '02 E39 M5, '00 E39 540i/6, '97 E39 528i, '92 E34 525i
Others: VW, MBz, Peugeot, Toyota, Olds |