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Originally Posted by Even Steven
Actually, it will not save you any gas. A little known fact about modern engine management systems is that they have the ability to cut off the fuel pulse entirely when coasting, such as a long downhill grade. Now, I'm not a Porsche mechanic, so I'm not 100% sure that Porsche does this, but I do know for a fact that most other manufacturers program their engine management systems to do this in order to raise their average fuel economy.
So the next time you're coasting down a hill, if you put your transmission into neutral, remember that you're forcing the computer to send fuel to your engine to keep it idling. If you were in gear instead, the fuel pulse may be shut off entirely by the engine management system, thus increasing your fuel economy.
If you doubt this, just do a little bit of research on the Internet and you'll discover it's true.
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You Sir, Are Correct. 
Modern engines use NO fuel to coast to a stop. In neutral there is no longer a mechanical linkage to the road to drive the rotation of the engine. Therefore something must be done to "run" the engine, so engine management must start the fuel flow.
Just think, you are getting those last few feet for
FREE. YAY!