We were out of town for a couple of days and I thought it would be interesting to see how the Model S behaves during that time.  It was parked in a garage that's heated to about 40F.  While we were away, the outdoor temperature was fairly cold so the average garage temperature was probably just about 40F (with a few windy cold spells and a few days above freezing).

Recharging usually occurred after about 30 hours, but one time it recharged after just 24 hours.

On average, the car lost about 7.5 miles/day of charge, presumably mainly due to heating the battery.

Upon our return, the car had a charge left of 229 miles, just slightly below the 235 miles of charge that it had when we left.

The car had firmware v4.1 installed.

It'll be interesting to see how much of this behavior will be tweakable in the future.  It'd obviously have been nice to say that we won't need the car until our return and hence the car shouldn't bother with heating the battery more than absolutely necessary.

For anyone curious, the raw data is available in this spreadsheet:

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