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I suspect that your loosing more mpg just from the cold weather alone. I have an electric car, and when it is cold the range is noticeably different. From rolling resistance to air drag, cold hurts you. In my car I have a ceramic heater element I took from a room heater I bought at home depot. I re-wired it to run at 375 watts for low power, and 1125 watts at high power. I have a 120 volt DC battery pack, so using a 120 volts AC heater element worked very well. Between using the heater and the cold weather effects, I think my range is reduced by 1/3. I still get at least 70 miles range in the winter, but in the summer it's over 100 miles. I suspect that worrying about your electric load in cold weather is only a small fraction whatever mileage decrease.
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