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Ben -
Solar heat. Park your car in the sun (like you want to in the winter, anyway) and make sure there is access for your batteries to either directly benefit from that heat, or at least get the residual heat from the passenger compartment.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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