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A variety of multicomponent emergency transportation fuel formulations (diesel and spark) are evaluated by means of bench tests, single and multicylinder engine dynamometer tests, and chassis dynamometer tests. A wide range of alcohol and liquid hydrocarbon extenders are evaluated according to the tradeoff between performance loss and base fuel stretch-out with increasing extender concentration. Changes in gaseous exhaust emissions are also given in relative terms as a function of extender concentration. Detailed chemical composition and physical properties of blend combinations and individual blend constituents are also included. Collectively, these data form the basis for the DOE Emergency Fuel Utilization Guidebook.