We have done 8000 miles in ours. On distance driving at 80mph we easily get over 40mpg. We try not to use it around town too much but we get around 36-38mpg when we have done a mix of town and local run arounds.
Never had less than 36. We both drive and we are not slow drivers, on the one time I did 90miles at a steady 70mph (in cruise control) it was reading 44mpg.
BMW X3 (F25) xDrive20d SE . . Alpine White. . Oyster Leather . . 8 Speed Servotronic. .RFTs. . High Beam Assist. . Electric Seats . . DAB Radio. .USB/Bluetooth