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that coasting (with engine off, out of gear) is illegal? Just curious, since it gets me about 3-6 extra mpg...

I think, if not mistaken, that driver behavior is regulated by the states. As such, there may be different rules from state-to-state.

It's a legacy law from when brakes and syncromesh didn't work nearly
as well and people were more apt to "lose control" of a coasting
car. There is no need for these laws nowadays, especially since
they're impossible to enforce and there are many times when any
car is effectively "in neutral" anyways, and it's time they just
went away. The more general laws and penalties covering "losing
control of a vehicle" cover the supposed problem without trying to
tell people exactly how to drive.
.
_H*

There is another recent thread (http://www.cleanmpg.com/forums/showthread.php?t=12914&highlight=neutral) on the subject, with the text of several states' laws pasted.