A sure-fire way to keep your car running in sub-zero temperatures

I live in northwestern Minnesota, and the past few days this entire state has been in the national news.  For what?  For being cold.

Huh?

Cold is normal for us Minnesotans, but these past few days has been awful cold.  I know plenty of people who start their vehicles in the morning, just before going to work, and . . . guess what?  They don't run.

I sympathize.  I've been there and gotten the T-shirt.  However, after many failed winters and busted power steering hoses, I now have a sure-fire way to keep my vehicles running, even when it's forty and fifty below zero.  I start my vehicles every 2-4 hours, depending on the temperatures, and let them run about 15-20 minutes.  I don't have a car starter, but if you did, it sure would make life much easier.

Yes, it may mean taking up at two or three in the morning to start it, but wouldn't that be better than waking up to a dead battery?