On a 2010 A4 premium plus, what is the number that shows up to the right of the cars total mileage number on the main display? Can't figure it out. So for example the display will say something like 10690 mi 1780 . I know the first number is the odometer reading. But what's that 2nd number? Thought maybe it was a trip computer but I have scrolled through trip computer 1 and 2 and reset both, and it didn't affect this.