For more on the Civic GX's natural-gas powertrain and the innovative home-fueling station that keeps it going at a fraction of the cost of gasoline, launch the slideshow.

Behold the car that could displace the Toyota Prius as the eco-ride of choice. The new natural-gas-powered Honda Civic GX uses domestically produced fuel–the same stuff your gas stove burns–that costs as little as one third the price of gasoline. The American Council for an Energy-Efficient Economy calls it the cleanest-burning internal-combustion vehicle on Earth.