Quoted from answerbag.com
"Modern vehicles are more intelligent than they were in the past. With massive computerization, sensors inside the car adjust the engine’s behavior based on the conditions. Engine warmup is almost a non-requirement, although most manufacturers will include instructions to do so.
In addition, idling a car for longer wastes fuel. As FuelEconomy.gov puts it, idling gets 0 miles per gallon. Cars with larger engines typically waste more gas at idle than cars with smaller engines."
Couldnt put it better myself. And I end my input before another pissing match ensues.
