This book contains the papers presented at the IMechE's Internal Combustion Engines: Performance, Fuel Economy and Emissions conference, at the IMechE, London, 11-12 December 2007. The conference was organised by the Institution of Mechanical Engineers (IMechE), one of the world's leading professional engineering institutions. This two day conference covered large and small engines for on and off highway applications. The four main themes were: Performance Fuel economy Fuels Emissions The conference addressed challenges posed by climate change, regulations and market fragmentation. It promoted the dissemination and discussion of research on the latest developments in technology and the responses to market, regulatory and operational pressures.