Hello,

Being that I work for MBUSA I will help you out a little...

To reset your trip computer, you will see a small black button around the perimeter of your dash...this is your Reset button (could possibly have a white "R" on it)

Any time a malfunction won't clear off your screen or you need to reset your trip computer, you press that.

What I assume you are talking about with your mileage is your option for "after start/after reset". After start is all your vehicle specs after you start your vecicle. After reset is for if you go on a trip, etc and want to guage all your vehicle mpg, time, etc.

Hope this helped,
BenzGirl