As its back to school time, and I have already begun to notice the number of people idling their cars. This is a terrible practice for the environment and has no benefit for your car. Modern cars are built in such a way that they do not need to idle. It is not hard on the engine to turn your car on and off. It does not save gas to idle. Here's a great rule of thumb: "The recommendation is: If you are going to be parked for more than 30 seconds, turn off the engine. Ten seconds of idling can use more fuel than turning off the engine and restarting it. And when you start your engine, don't step down on the accelerator, just simply turn the key to start."
If you are interested, here is a great site about the myths of idling your car: http://www.consumerenergycenter.org/myths/idling.html.
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