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If it heats when you are in a cold start, you are already running at higher RPM and cold enrichment. It could be that additional alternator loads are not that costly mileage wise and the additional load would reduce warm up times as well. While it might not hurt your mileage it should help you have a functioning heater more rapidly and if most of the current drain is during your warm up cycle when most of the fuel is used to heat the engine it might be a wash, but my thinking is it is probably for very cold winter temperatures.
regards
Mech
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