+0.53 (+1.14%) By last year, though, the excitement was gone. His projects were no longer about advancing the engine, just nursing along existing technology. All the buzz had shifted to electric vehicles. In December, Penkevich took early retirement at age 59. "It got to feel like you’re on a maintenance crew," he said. For more than a century, auto makers continually honed their gas and diesel engines, sparring over which had greater power, better fuel efficiency, more durability or delivered a smoother ride. Now, some of the world’s biggest car companies are sending the combustion engin...