Tom Stephens, General Motors Corp. Powertrain Div.'s vice president, says he believes new-generation passenger-vehicle turbodiesel engines soon will approach specific output figures of 80 hp/L. Despite such promising output, however, he says the problem for U.S.-market adoption remains tough upcoming emissions regulations. "I look at the new emissions standards in the U.S., and I don't think we're smart enough to figure that out," he asserts. "We (auto makers) need some (regulatory) relief."

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