I have a X5 (E70)-3.0d and a X6-35d(same engine as X5 3.0sd)

I drive 100% in CITY and the average consumptions are:

13.5 - 13.8 l/100km for the X5 3.0d

12.2 - 12.5 l/100km dor X6 sd

Both cars have adaptive drive and almost all the options.