DEARBORN, MI – The unsure future of the Earth’s resources and worldwide government expectations keep penny-pinching auto makers in a quandary when it comes to building powertrains. But some top-ranking automotive engineers say consumers ultimately have the upper hand in determining future vehicle-engine technology. Optimism about natural gas as a power source is expressed at the U.S. Department of Energy’s Directions in Engine-Efficiency and Emissions Research ...

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