In an update promised by Elon Musk earlier this year, Tesla cars can stream Netflix ... The mobile Tesla app that lets you control the climate, unlock the car, and other options was also updated ...

Streaming vehicle signals to the app, for example, cost $1 per 150,000 signals; performing commands on a Tesla device costs $1 per 1,000 requests; polling a limited set of data from the vehicle ...

but also a much higher hit to the usability of free apps like A Better Route Planner: "The Tesla data streaming is a technically good solution that enables really good real-time data for users.