A major reason you don’t drive a fuel cell car already: There’s nowhere to get a tankful of hydrogen. This infrastructure problem is not lost on General Motors engineers, who’ve found a new source: the local filling station. They developed a catalytic device that strips hydrogen from regular gasoline. It’s not as efficient as pure hydrogen, but it produces 50 percent better fuel economy. Demonstrated in a prototype Chevy S-10 this year, the advance brings fuel cells one step closer to the family car.