Well, to answer the 4th question:
Electric companies burn fuel more efficiently than any car (or so I have been told), so using the electric car would reduce your carbon footprint, but not eliminate it. Very good point you have though, as some people think by driving electric, they would not be polluting at all. Ed Bagely, on an old episode of MTV Cribs from the mid-90's, showed how he used solar energy and a exercise bike to recharge his EV-1.
As for the long roadtrip question, that was brought up in the documentary, but I am not sure if they really found an answer other than showing some cheap batteries this old couple developed that were supposed to outlast the life of an average car and hold a loooong charge.
I am looking at getting a Toyota Prius. At the end of the video, they show a Prius being plugged into a standard outlet in a garage. After a night of charging, you get 125 mpg for the first 50 miles driving. The modification is cheap. That is impressive. Seeing as how every bit helps, I am all for that.
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