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I see some pretty wide variations in ROI calculations here. Obviously there are quite a few variables such route, temp and vehicle, but, I suspect the more conservative estimate (christofoo's) is probably most realistic.
Given that, I think a direct payback in fuel saved is questionable, but the other benefits of comfort, emissions, wear and tear make it worthwhile.
I think I will start by moding the wife's '09 Sonata. She could give two craps about the wear and tear/fuel/gas savings, but, the idea of being pretty much instantly warm will probably give her the incentive to have to reach down and unplug it in the morning. Won't do it to the rest of the fleet as they are older and less likely to be around in a few years.
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