I wonder what happens in the Winter if you don't drive it for a while. From what I've read, one of the urea tanks is electrically heated, to stop it from freezing. So If I park it at the airport for a couple of weeks when it's 0 F or below, do I return to a drained battery and/or busted urera tank? Or is it insulated enough that it doesn't take much power to keep it from freezing?