A little discouraging as it appears they are not going to do the 385 / Mammoth Route any longer that was originally planned for this past fall / winter. That would kill getting a Model X and we'd need to stay gas. Understand the tradeoffs, but kills that for us.
In another thread someone said they had contacted Tesla about 385/Mammoth and this is the reply:-
Thank you for your email. We are so glad to hear you are enjoying your car and appreciate your continued your support in Tesla.
We updated our maps just yesterday and there are a few dots that did not transfer over in the process. The route along 395 is one of the routes that was mistakenly left off of the map and this is being corrected on the backend as we speak. In fact, we can let you know that this route is a priority for us and you will be able to drive from Los Angeles to Mammoth and back with Model S as planned in 2014. Apologies if we scared you with that omission and thank you very much for bringing it to our attention.
If you have suggestions for future sites, please tell us about them
here—our developers use this database first when scouting new Supercharger locations.
Keep checking our website for new site announcements (there are lots more coming soon across the US!). Again, we appreciate your enthusiasm in Tesla and our Supercharger technology.
Thanks,
The Tesla Supercharger Team