The mileage reading on my X1 seems to have gone from 19999 to 30000 instead of 20000 miles. I hadn't noticed this until now as I work offshore and my wife drives the car. I have a service note from Dec 14 showing 19000 miles and a year later it is at 40000. There is no way the car has done that amount of miles. Has anyone heard of this or know if there is anyway of checking the exact mileage the car has done?