3 of 5
3. Gassed up
Gassed up
The Clarity's fuel stack is about the size of a microwave; older versions were 10 times larger.
Honda's new Clarity sedan can travel 240 miles on a full tank of hydrogen. The fuel cell is twice as efficient as a gas-fueled engine of similar output.

NEXT: Inside the cell
Last updated October 14 2009: 9:08 AM ET
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