Long renowned for superior fuel economy, but notorious for foul exhaust, diesel cars have never been widely popular in the United States. But that soon may change as a new generation of “clean” diesel vehicles come down the pike. These won’t be the smoke-spewing, smelly, noisy and underpowered engines of the ’70s. And by the end of this decade, we’ll have diesel cars that meet the same stringent emission standards as those for gasoline vehicles.
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