Sounds sweet - I just purchased a 2011 X5d too - and in mixed driving, averaging about 21mpg, and on the highway, can hit 30mpg - not bad considering the X5 is a 6500 pound car (at least mine is). I also have many of the same packages that you have too, and 59K miles, still an amazing car - love it! (check out my profile) My wife and I have to figure out who takes the X5!
Many safe miles, mate!