I haven't tried it recently myself either, but I interpreted this...
"Can I get Premium Connectivity features by using a mobile hotspot?
No. Over-the-air software updates may be downloaded over Wi-Fi networks, including mobile hotspots, subject to fees and restrictions of your mobile carrier. However, other Premium Connectivity features like satellite view maps and streaming media are currently not available over Wi-Fi."
This says that leveraging a hotspot for the premium features won't be possible, and I made the assumption that this would be that you wouldn't be able to use a hotspot while the car was in drive. Maybe I'm wrong.
Also to correct something else I said earlier...standard maps are part of the standard connectivity, but satellite views will only be possible with the premium package.