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All types of transportation operate under conditions and environments that are without exception nonlinear. Prior investigations and analyses of component failures and system nonlinear behavior led to a method for improving energy efficiency. Accordingly, this paper includes an overview of the surplus energy effects on systems when nonlinear operating conditions exist. Also included are the background and test results for an automotive system that partially recovers surplus energy. A highly regarded automotive test laboratory performed independent tests in accordance with US Federal Test Procedure (FTP) 75 that indicate approximately 2% improvement in fuel economy or 0.4 miles per gallon improvement. A US Patent was issued for this surplus energy recovery system.