I think people would be much happier if the advertised combined mpg was about 45. It's the realms of fantasy that produce figures of 56mpg extra urban that should be reviewed as they are misleading. I think it's a combination of BMW using a certain optimum setup (17" low rolling resistance tyres for example) for the test car and the test cycle itself not really being anything like real driving patterns
BMW X3 (F25) xDrive20d SE . . titanium silver . . titanium front grille . . 309s . . xline . . xenons . . black leather . . alu trim . . professional multimedia package . . dynamic package . . climate package . . electric seats . . folding mirrors . . servotronic steering . . DAB radio . . business speakers . . sun protection glass . . split rear seats . .