I let mine run every morning unless it's warm spring/summer ... probably 5 minutes ... longer when it drops below freezing. I do this for personal comfort as much as I prefer the way my truck responds when it's warmed up.

I agree that todays vehicles don't need it like older ones ... that's a no brainer. When I was 16 my first ride was a '66 GMC 1/2 ton pickup. Manual choke ... talk about a cold-blooded beast!