I start it, scrape the windows, plug the iPod in, get situated, and then set off. So at most it's idling for maybe 2 minutes. If I don't need to scrape the windows I start it and leave. As everyone else has said easy driving all the way to work or where ever I'm going. You're car isn't truly warmed up anyways while sitting idling. Sure the engine components are but your tranny, diffs, any bearings in the suspension, and stuff like that is still cold. My motorcycle is the only thing I let warm up to close to operating temp before using. But the engine oil is also the transmission fluid so it does shift smoother after idling.