I am not exactly sure, but I believe what you are seeing is the instant MPG. Was the 99.9 displayed while the engine was on and the vehicle idle? This value is dynamic and should change when the car is actually moving. I have seen this in my mom's 3 series and wife's 5 series.Hi,
I'm new in this forum and say thanks from the beginning.
Since yestarday my 525i display shows 99.9 when I choose the MPG option, clearly an error.
I would be so happy if somebody can help me in the troubleshooting.
Regards from a chilean BMW owner