Dumb question. I'm driving my MYLR around Denver with a ski rack in 16 degree weather. Was seeing 485 wh/mi. Have the ski rack on because I'm driving to the mountains tomorrow, but this consumption is giving me range anxiety. Have not driven in weather this cold before. My question is this: how much of this consumption is due to the temperature, and how much is due to the ski rack? I have a Thule SnowPack rack for reference.