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The Mercedes-Benz E320 Bluetec sedan, which gets a combined 35 mpg, is the least polluting production diesel ever made. Its V6 engine uses higher injection pressure and higher compression ratios to combust more of the fuel, leaving less waste. In addition, the exhaust system employs four separate scrubbing technologies, including two catalytic converters and a particulate filter, to reduce carbon monoxide, unburned hydrocarbons and nitrogen oxides. The introduction of low-sulfur diesel fuel makes the system useful in the U.S. (sulfur clogs particulate filters). It’s slated next for Mercedes SUVs. mbusa.com
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