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There is a clear concern about air pollution on the planet. Measures to reduce CO2 emissions in the Earth's atmosphere were taken to minimize the possibility of global warming. In the context, many countries have created laws and incentive programs that encourage an automotive industry to develop innovative technologies to increase the energy efficiency of their vehicles, thereby reducing fuel consumption and consequently reducing CO2 emissions. Often technologies are applied in combination so that there is an increase in energy efficiency of the vehicle. The objective of this work is to present an experimental evaluation of the energy consumption and reduction of CO2 with a combined application of the Stop & Start measures and mechanical decoupling of the alternator. The new alternator with mechanical and consequent electrical decoupling, consists of a pulley integrated to an electromagnetic clutch.