It is a temptation that should be resisted at all costs even on the coldest days. Yet as the brutal blast of arctic air stretches into its second week over the Washington metro area, many motorists in the region will have a strong compulsion to warm up their cars for a few minutes and then dash back into their home or apartment, and all of its comforts, while their cars idle unattended in the driveway.  It can a big mistake on several fronts, counsels AAA Mid-Atlantic. 

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