EarthTalk: Why doesn't U.S. have high-mileage diesel cars, like Europe?

Dear EarthTalk: I don't understand why there are many European diesel cars with very high mileage ratings that are not available in the U.S. Can you enlighten? (John Healy, Fairfield, Conn.)

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<p><a href="http://www.physorg.com/news160071387.html">EarthTalk: Why doesn't U.S. have high-mileage diesel cars, like Europe?</a></p> <p> Dear EarthTalk: I don't understand why there are many European diesel cars with very high mileage ratings that are not available in the U.S. Can you enlighten? (John Healy, Fairfield, Conn.)</p>