Something very odd happened to me today and I'm wondering if other people have experienced the same thing. It was quite cold today in Chicago, in the low thirties, our first cold day of the season. On my round trip to work (~13 miles each way), I used an astonishing 450 WH/mile. Last winter, on days when it was even colder than today, I'd typically use only around 370. A lot of the energy was used to heat the battery. I got a message when I got in the car this afternoon after having left it outside all day saying that 'the battery is heating' and that full power was not available. This message was on for about 20 minutes as I drove. What's very odd is that I never saw a message like this last winter. I'm wondering if this due to a software update? I'm still on version 4.5. Has anyone else noticed a difference between their energy use in cold weather this year and last year?