Concerns regarding global warming have increased the pressure on automobile manufacturers to decrease emissions of CO 2 from vehicles. Diesel vehicles have higher fuel economy and lower CO 2 emissions than their gasoline counterparts. Increased penetration of diesel powered vehicles into the market is a possible transition strategy toward a more sustainable transportation system. To facilitate discussions regarding the relative merits of diesel vehicles it is important to have a clear understanding of their CO 2 emission benefits. Based on European diesel and gasoline certification data, this report quantifies such CO 2 reduction opportunities for cars and light duty trucks in today's vehicles and those in the year 2015. Overall, on a wellto-wheels per vehicle per mile basis, the CO 2 reduction opportunity for today's vehicles is approximately 24-33%. We anticipate that the gap between diesel and gasoline wellto-wheel vehicle CO 2 emissions will decrease to approximately 14-27% by the year 2015.

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