Just noticed that page 309 in the Fiesta's manual it specifically states that "Warming up a vehicle on cold mornings is not required and may reduce fuel economy." I guess people can stick with what they're comfortable with, but I still think it's a waste of gas.
On a side note I'm amazed that Ford's manuals all look the same no matter what model year car you buy. The formatting and graphics look exactly like the manual for the Focus. Brings back a few memories.