I was thinking more like a chemical or non-chemical additive that would take the freezing point closer to petro-diesel.
The car will probably be constantly parked in a garage that has geo-thermal pipes in the floor, so hopefully it will stay above 50* in the winter.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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