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The Coolest Highlights from This Year's Auto Shows


Jeep's Bluetec Grand Cherokee is said to have the cleanest diesel powertrain in its class. Shown in Detroit, this engineering concept features DaimlerChrysler's Bluetec clean-diesel technology, which has the potential to meet emissions standards in all 50 states. The vehicle uses an efficient diesel engine, an oxidizing catalytic converter, a diesel particulate filter, and selective catalytic reduction (SCR), which reduces nitrogen oxide (NO) emissions. SCR is an exhaust-gas treatment that converts NO into nitrogen and water vapor through the use of ammonia. Clean-diesel vehicles improve fuel economy by 30 percent and reduce carbon-dioxide emissions 20 percent, compared with similar gasoline vehicles.


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