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Not many other transportation alternatives allow you the option of generating the "fuel" you need to "fill the tank" right there where you live. Biofuels (esp biodiesel) are close, but you still have to go out & get the ingredients for each gallon you end up needing to put into the tank. But once you have enough solar panels to generate the power needed to fill your electric car, the feedstock (sun) is delivered to you "for free"
Yes, there's the initial cost of the panels, and there are periods of time that the sun doesn't shine, etc, but I can't think of any other transportation option (except human power!) that can make it as easy as the combo of solar plus electric cars for self-sufficiency.
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