I have a E70 pre-LCI 3.0d, can achieve 11-12L/100km around town, 9-10l/100km on highway.

You should able to get better fuel economy with the new 8 speed gearbox and extra power/torque on the new diesel engine.

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'07 X5 3.0d - Black Sapphire Metallic / Camel interior
Specs: Sport pack, Executive, 7 Seats, OEM 336, Hifi
Mods: Aero Kits, Titanium grilles, 4.8i exhaust, Tinted, ///M Footrest, OEM Sport pedals, OEM Rubber mats, OEM Sunshades, LCI Taillights