This is actually a set of features you can access within the Mercedes Me Connect app. They allow you to monitor data points such as tire pressure, brake fluid, coolant levels, and the status of ...

The on-demand feature can be purchased online at the Mercedes Me Connect Store and installed via an over-the-air update, meaning a visit to a dealership isn't required.

Mercedes-Benz electric vehicle owners in North America who want a little more power and speed can now buy 60 horsepower for just $60 a month or, on other models, 80 horsepower for $90 a month.