First of all I love that we get our cars upgraded with firmware for free! Seriously, that alone is awesome. Everyone has different preferences and wish lists. But let's not talk about that for a moment. I'd love to know what feature that was added with a firmware update is your favorite so far? For me there are two features: - energy prediction for navigation - guide lines for backup camera Both these features turned out to be extremely useful to me! The Model S is my first car with a backup camera and without any guide lines I found it hard getting used to the distorted wide angle view. I found myself turning and looking back most of the time when backup up. I just had a hard time aiming. Now with the lines it's 100% better. I use the camera now for driveways and to back into parking or Superchargers so much more confident and quicker. The energy prediction is probably the most important feature I was missing. Before I had to guess the energy usage to my destination and since I had no idea about elevation changes and road limitations it was always a very rough guess. Same with doing road trips and estimating how much I need to charge to make it to the next Supercharger. Now it's so much easier and best of all, it is always updated in realtime, even and most importantly when charging. After using it for a few weeks now I got a good idea how much driving style corresponds to the energy prediction. It really makes taking road trips so much easier and more convenient. It is especially helpful in adjusting speed in a way that you arrive at a Supercharger with as low of a charge as possible (to get the fastest charging time). What are your favorite features?