Honda's first new zero-emission, hydrogen fuel cell car rolled off a Japanese production line June 16 and is on its way to California. Honda expects to lease up to 200 units of the zero-emissions vehicle there within a year at $600 month including maintenance. The FCX Clarity, which runs on hydrogen and electricity, emits only water in its exhaust. It is also two times more energy efficient than a gas-electric hybrid and three times that of a standard gasoline-powered car, the company says.