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I don't turn off my Versa's engine unless I pull up to a light that I know from experience has a frustratingly long wait. Or there's a train. I figure even at 1/2 gallon per hour, any savings I get will be negated by the increased workload on the starter and the engine wear on startup. I can buy a lot of fuel for what Nissan would charge me to replace my starter.
I read a book a while back (How to make your car last forever) that explained how every time an engine is started, before the oil pressure builds up to do it's normal job, the metal-to-metal wear on the main bearings and the other initially non-lubricated parts of the motor like the camshaft and timing gear is the same as if you drove 500 miles.
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