I have a 2005 545I and have noticed the miles to empty is going down faster than the odometer is going up in miles. When I manually calculate the MPG it's normally between 20-25 which corresponds to what the car says. When I talked to the dealer they said it was operating correctly and it was a point in time calculation. If that's the case, I still don't understand why the miles to empty is clicking faster than my odometer is going up if I'm getting 20-25 mpg. Am I confused on what information this is displaying? Any thoughts would be welcome.