he market has already spurned electric cars twice. First when cheaper gasoline cars and low fuel prices made them obsolete in the 1930s. Then again after General Motors, Ford, Toyota, Honda, and Chrysler revived them in the 1990s—and then killed them off. Now, electric vehicles are getting a fresh jolt of attention. Oil is above $70 a barrel. Sony Pictures will release a documentary touting electric cars titled Who Killed the Electric Car? June 26. And Silicon Valley startup Tesla Motors said earlier this month that it has raised a $40-million Series C round of financing led by VantagePoint Venture...