Last month’s vote by the California Air Resources Board (CARB) to require cuts in passenger-vehicle carbon-dioxide emissions – and by definition, fuel consumption – by approximately 30% between 2009 and 2014 has powertrain engineers searching for solutions. CARB's target – if not successfully challenged by auto makers – is to phase-in CO2 emissions cuts during the 2009-2014 period from 315 grams per mile to 211 gpm for passenger cars (36% reduction) and from 422 gpm to 311 gpm for ...

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