what you got to do is go out in the morning pop the hood and throw some steaming hot water onto the engine and your good to go no need for warming up....silly rabbits
one of my friends actually had a teacher who would pour hot water on his car because he thought it would make it warm up faster. Its crazy the things people will do just to save a few cents on gas. Another thing that gets me is people who drive halfway across town to get gas for 2.71 because the station by their house had it for 2.73
i let mine idle anywhere from 5-10 min. but mine sits in a garage...not heated but still is warmer than outside. and she actually runs stronger doing this