I have been reading mixed reviews about how long to let your car warm up before driving in the winter months. Most of the articles say that the best way to warm it up is to let it idle for 1-2 minutes, then drive gently until it reaches its optimal temperature.
My concern is the following:
When I start the car in cold weather the tachometer usually sits around 1500 rpm - 1750 rpm. When it has been running for a while it idles at 750 RPM and the car runs much smoother when it's at this point. It takes almost 10 minutes of idle to get it warmed up to 750 rpm (in about -10* weather).
Is it smart to idle and wait for it to get to it's regular RPM before driving off?
Will driving off before it gets to a low RPM be harmful to the car in the long run?