Those mileage figures don't look very good. I got 14.2 l/100km in the city, and up to 10.5 l/100 km on the highway, with my gasoline X5 3.0, and that was with an automatic. I would have hoped to see 11 l/100 km around town, and 8 l/100 km on the highway, for a diesel.

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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