The Mazda H2RE will technically travel the claimed distance - on dual fuel tanks. While other carmakers are focusing on using hydrogen to power fuel cells which in turn power electric motors, the Renesis rotary engine on the H2RE has been tweaked to actually burn hydrogen. A switch in the cockpit allows the driver to toggle between gasoline and hydrogen consumption. While having gasoline backup can be considered cheating, 390 miles is a huge improvement over the 160 or so miles that have been seen with previous hydrogen powered cars. Now if I can get more than 200 freaking miles per tank out of my Evolution, we're home free.