I've found a few threads on this scattered around the Internet, but not good solution. On Christmas day (less than 72 hours ago) I parked my Model S at DIA (Denver Int'l Airport) in cold weather... about 25F. Knowing the car's batter would discharge while I was away, I did a range charge at home (270 miles on my 85D), and had 220+ miles in the battery when I parked it. Now, three days later, my app is telling me the car has 40 miles of range remaining. That's not enough for me to get home. And by the time I return to the car (next Sunday morning) it will likely be much lower... perhaps even low enough that I need assistance. This has happened to me a few times now, and I don't know what to do. What could possibly be draining the battery so much so quickly? It seems to be a problem many other people have had... This has to be the last time I leave my car at the airport for more than 1-2 days... I keep getting stranded.