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Just to be clear this is my P85 I am talking about but the trend will apply, and I only have one winter under my belt.
On salt covered 0F roads I am not an aggressive driver either but can still see the average consumption stay over 500wh per mile for weeks at a time. In moderate weather with no heavy HVAC use I average 280wh/m enjoying the go pedal some, speed limit is 45mph.
7 mile each way commute, means the battery is basically heating any time I am driving in winter. I do warm it up for 15minutes plugged in before leaving.