If you are stopped for more then 30 seconds, shutting down a warm engine is actually more fuel efficient then just idling. It doesn't use much gas to startup a warm, fuel injected car. If you have a carborated car it does use more gas to stop and start, but today's modern, fuel injected cars hardly take anything to start up once warm. I'll dig up some references, give me a minute.
http://www.memagazine.org/june07/dep...input_out.html
Quote:
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If you believed the myth that restarting takes more fuel than idling, the myth is busted. Our research showed that a V6 restart takes about the same fuel as 5 seconds of idling. We expect a V8 to save more and a 4-cylinder less.
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