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Tesla in Winter?

Tesla in Winter?

Tesla S in Winter?     What cold weather provisions are there built into the design of the model S?
What effect do these have on battery life / mileage range? Such as interior heater, rear window defroster, etc?
In other words! If I am driving in winter with the interior heater and rear window defroster on, what % loss of mileage distance / battery charge should I expect? My guess 25% reduction in mileage?

Thanks, Currie