TRAVERSE CITY – Diesel engines are extremely fuel-efficient but have certain emissions issues, while gasoline engines are much cleaner but less efficient. That’s today’s paradigm – but tomorrow, the inherent differences between spark-ignition gasoline engines and compression-ignition diesels won’t be as clearly demarcated. Thanks to new technologies, diesels are getting cleaner and gasoline engines may rival diesels in efficiency, says Alan Taub, executive director, Science ...

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