The MBUX system seems to only display 55MPH when your map is out of date for the region you happen to be in. Now, here's the kicker; MB only pushes Over the air map updates to one region that you have set as your "home region". Your home region can be changed on the mercedes.me website once you have your vehicle set up in there. All other regions of the USA, Mexico, and Canada can only be updated to the latest version via a download to a USB stick on your home computer (or laptop) and then uploaded into the MBUX system via that flashdrive. The process is a bit clunky but it does work. I just did mine, and reset my home region to the northeast. A quick drive and my display now reads correctly. Also, a MB dealer should be able to do the update of all regions USA + Canada & Mexico as well.
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