We have a 2007 X3 3.0 si, 6 speed manual gearbox, approx 3000 km to date so not really broken in yet. On the highway at 100 km/hr average I have seen 10 litres/100 km on the OBC, (all of this in the first 1000 km), but now with mainly city driving it is sitting at 10.8 litres/100 km, running on 93 octane premium [(R+M)/2, or pump octane], at sea level. We have been gentle with it up to now, and it hasn't been heavily loaded yet. Still, a lot better than you are seeing.

Jeff

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue