The X-Prize competition for fuel-efficient cars is, as you might expect, dominated by hybrids and electric cars. So the Edison2 Very Light Car stands out. It’s a four-door sedan—the last such car remaining in the competition—and it runs on good old-fashioned gasoline, NPR reports.
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Very Light, Gas-Powered Car Gets 100mpg - 700lb car takes on electric and hybrid models in X-Prize competition