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Fuel economy is one of the main drivers of the automotive industry. This subject is becoming more and more important showing a clear upraising relevance tendency. The automotive community is researching and developing many solutions and trending technologies to improve the internal combustion engine, realizing its existence is under risk due to strong greenhouse gas impact. Some innovative technologies focus on the internal combustion engines replacement by other energy conversion systems. Other new technologies improve internal combustion engines efficiency but, in most of the cases, impacts on its costs and consequently on its viability, especially considering the entry level passenger cars. In these applications, the cost impact is hardly acceptable by the customers and this market represents a considerable part of the global automotive industry. Any opportunity to improve the vehicle efficiency with minimum cost is welcome.