Lest we forget that fuel-economy gains can come through normal evolutionary means, Detroit Diesel has announced that it can improve the thermal efficiency of its heavy truck engines to 45 percent while meeting the strict 2007 EPA emissions standards. That's approximately 5-9% better than current truck engines. Better yet, the company sees 50% efficiency as a realistic goal while meeting 2010 emissions regulations. Hopefully this is the sort of thing that's scalable down to passenger car and light truck diesel engines.



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