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I was driving home today, and it's -1C (30F) and there's a light snowfall. I noticed that while the rest of my car was covered in snow, the rear window was clear. I pulled over and sprinkled some more snow on, and before you know it, it melts -- and, it has the characteristic rear defrost melt pattern (lines across the glass). The thing is, my climate control system is on AUTO (21C), and my rear defrost is OFF!! I thought AUTO only adjusts the air heating not the rear defroster... What I'm wondering is, is there some sort of temperature threshold so that the rear glass defrost is automatically turned on (even without the switch being pressed or illuminated)? Does anyone else find this to happen to their vehicles? I'm guessing that this would have a profound impact on range. The other day, when it was a few degrees warmer, I had at least 10km of additional range. Today, however, with the same battery charge, and a few degrees colder, my range is down as well -- and maybe, just maybe, this is attributed to our cars having the defrost automatically turn on. Thoughts?