I don't know if Nissan does it with all vehicles, but when I went to test drive a 350Z, the dealership let me keep it all day to see if I liked it enough to buy. It had exactly the effect they expected ;-)
For a new type of vehicle like the Leef, it would be an even better idea.
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They also partnered with Hertz, so you'll be able to rent one to really see how it does:
http://www.treehugger.com/files/2010/02/hertz-car-rental-nis...
This is a good move, because a quick test-drive won't be enough to truly determine if an electric car would work for your lifestyle.
I don't know if Nissan does it with all vehicles, but when I went to test drive a 350Z, the dealership let me keep it all day to see if I liked it enough to buy. It had exactly the effect they expected ;-)
For a new type of vehicle like the Leef, it would be an even better idea.