Generally, fuel economy is greater and the combustion reaction
is more complete when a vehicle is run on a lean mixture.
Additionally, the final combustion temperature is
generally lower, reducing the amount of pollutants, such as
nitrogen oxides, emitted in the exhaust. There is a limit to
how lean the engine can be run, as lean operation can significantly
reduce the power output due to a reduction in the
volumetric heating value of the air/fuel mixture
Generally, fuel economy is greater and the combustion reactionis more complete when a vehicle is run on a lean mixture.Additionally, the final combustion temperature isgenerally lower, reducing the amount of pollutants, such asnitrogen oxides, emitted in the exhaust. There is a limit tohow lean the engine can be run, as lean operation can significantlyreduce the power output due to a reduction in thevolumetric heating value of the air/fuel mixture
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