Diesel engines are a bit like soccer.
Soccer is the most popular game in the world. But the prospect of Monday Night Football stepping aside for men in shorts is about as likely as U.S. auto companies ever replacing their gasoline engines with diesels.
The soccer thing is a matter of taste. But diesels offer clear benefits over gasoline. So at a time when automakers have to gear up for stringent fuel-economy rules -- and clean-diesel technology has cleaned up diesel emissions -- you might think that diesel's moment has come.
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