As more government entities pull back on their once-overly ambitious fuel economy standards, enthusiasm for electric vehicles is starting to wane. Automakers, too, have announced major investments in gas and hybrid powertrains as the market shifts. That said, many companies are still looking for ways to wean off gasoline. BMW is one of them. Alongside Honda, Hyundai, and Toyota, BMW still believes that hydrogen can be a viable source of vehicle propulsion over the next decade. The company debute...