PREFACE This text was written as a reference for personnel responsible for purchasing@ maintaining@ and operating vehicles for state and local government agencies@ school districts@ universities@ and private companies. Current information on alternative fuels technology@ legislation@ vehicle conversions@ fuel properties@ and refueling equipment is included. Alternative fuels legislation considered to be representative of state law is included in the form of law enacted by the State of Texas. The federal Clean Air Act Amendments of 1990 and the Comprehensive National Energy Policy Act of 1992 are also discussed in relation to their impact on the use of alternative fuels. A review of basic engine performance and terminology is also presented. This review provides the reader with the basic foundation of engine technology necessary to fully understand the material presented in later chapters. An overview of cost benefit analysis relative to the alternative fuels conversion decision is included to assist the reader in determining the economic viability of adopting a particular fuel. Refueling facilities necessary for the various alternative fuels are described. Vehicle conversion hardware and procedures for both spark ignition and compression ignition engines are discussed and a list of vendors is provided. A glossary of terms relevant to alternative fuels is also included. This book can be used as a reference and as text for alternative fuels instruction. The information presented here was originally assembled for use in a series of seminars on alternative fuels and is intended to provide