What should I do about this?
Should I tell him it's a bad idea to keep the cars idling that long? if so, how should I tell him?
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M$2 Answers
As such, I wouldn't go out of my way to tell him. But, if you were in friendly conversation and somehow the subject came up, you could tell him. Just don't act like you're superior for knowing it. Tell him you just read it in an article and that you're not positive about it but he should look into it. If he corroborates your comment with independent research (or by going to Mahalo Answers), he will be more likely to listen to the advice.
If you want your car warm when you leave in the morning, the best option is to park in the garage, but I realize that's not an option for everyone.
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M$
Good luck!
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M$
"My guess is that he's not doing it to warm up his engine really. He just wants the car nice and toasty when he gets in to leave for work or wherever. "
- not sure, because he does it even during warm weather.