Mercedes-Benz showcased DaimlerChrysler’s latest technology in the F600 Hygenius, a futuristic four-seater that uses fuel cell propulsion and electric drive to return a claimed average 97 mpg. Revealed at the Tokyo motor show, the research vehicle’s theoretical range of 250 miles per tank of hydrogen represents a 16 percent improvement over the German automaker’s previous fuel cell vehicles. Mercedes research and development boss Thomas Weber says the F600 Hygenius advancements are “a big step toward the future production potential of fuel cells” that will appear on future cars.