Well I say let it sit there for 2 - 3 minutes. Until the revs come down to about 1,000rpm. If what they say in the manual is true then you should turn your car off when sitting in traffic or at a set of traffic lights... isn't that the same as letting your car idle??? Here in Picton it gets to any where from -1 to -7 in winter. So when I'm getting ready for work every morn I go out at 6:30 and start the car put the heater on full blast on the windscreen to melt the ice off and put the rear demister on and then leave at 6:35, 5 min later. The ice is melted the car has warmed up and its nice and warm inside. I don't care what anyone says I will always let my car warm up first before I go anywhere.. How would you like it if you didn't get a chance to warm up and had to do a 5 km run with out warming up? :D (I love my lux)