Electric and Hybrid vehicles (EVs & HEVs) can term. In fact, HEVs represent a cross between the offer a sensible improvement of the overall vehicle environmental conventional cars and the EVs, making use of at least two impact, achieving at the same time a more efficient energy use. energy sources (an electric motor with an internal combustion Nevertheless, these objectives can be reached only in presence of engine); so, HEVs appear the most realistic solution to a widespread of these technologies. Today one of the most achieve low emissions and improved fuel economy, without important elements which slacken the spreading of the EVs & s HEVs is the gap between the costs and the performances of the In veicl pormane, sdeuitpad vreiability.