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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
Toyota ES3 concept diesel-electric hybrid is experimentally rated at 47km/liter or 103 mpg. Weighing 700 kilograms, the has a greater relative fuel efficiency than the best automotive fuel cells, according to the author. In addition to the concept cars fuel-sipping 1.4 direct-injection diesel turbo engine and hybrid drive, it boosts a slick 0.23 Cd ratio and a continuously variable transmission (CVT).