The current status of the technologies of alcohol utilization in highway transportation diesel engines is reviewed. The use of methanol, ethanol, and certain of their derivatives in diesel -engine -powered vehicles is treated in this volume. Volume I covered alcohol utilization in vehicles powered by spark ignition engines. The results of engine, vehicle, and fuels testing are summarized. The topics of fuel properties, power output, fuel consumption, thermal efficiency, ignition delay, rate of pressure rise, engine noise, operability, exhaust emissions, smoke, materials compatibility, engine wear, and safety are discussed based on the data available at this time. The status of the technology at the time of the last comprehensive survey (1981) is summarized and discussed. Significant advances made since that time are delineated, as are remaining information gaps and areas in which more extensive investigation is still needed.