Other Engines, Other Fuels: An Overview

The current state of development of several alternative engines for light-duty ground transportation is reviewed. The development of such engines will affect the introduction of various types of fuels, and the availability of fuels may place restrictions on the type of engine used. The interdependence of fuel and engine types is considered. Although the introduction of new engines will change the fuel-use pattern, continued use of present spark-ignition engines will require a continued supply of high-octane fuels.