For the USA, the new F30 328i was recently rated as 24 MPG City and 36 MPG Highway (USA gallons). See here:
http://www.fueleconomy.gov/feg/Find....n=sbs&id=32175
What do you USA guys think it will be in the X3? How much do you think the AWD and extra weight will reduce those numbers?
(By teh way, ignore the picture in that website. It's an incorrect photo of a E90)