This book describes in detail the technologies that are in use or under development at the end of the 20th century, which are designed to provide high-quality fuels and ensure their optimal use in the engines used to power automobiles, trucks, aircraft and ships. All types of fuel are covered: gasolines, diesel fuels, liquified petroleum gas, natural gas, biofuels, jet fuels, heavy fuels, and fuels for special uses. The evaluation criteria include vehicle performance and driveability, reduction in fossil fuel consumption, and environmental protection. The specific situations encountered in each region of the world (including the United States, Europe, Japan and the developing countries) are analyzed and compared, with a focus on energy, economics and politics. This book is a scientific work, yet easy to read; it is objective, yet actively involved. It should be a useful reference work for those seeking pertinent, reliable and comprehensive information on the subject of fuels and engines.