AN INITIAL REVIEW AND EVALUATION OF EIGHT CANDIDATE SYSTEMS YIELDED FOUR DEVICES WHICH WERE CONSIDERED SUITABLE FOR DETAILED EXAMINATION AND ANALYSIS: SUPER CHARGING, A BI-LEVEL DRIVE RATIO DEVICE, A MODULAR ENGINE SYSTEM, AND A VARIABLE-CYLINDER ENGINE. THE REPORT DESCRIBES THE ANALYSIS CONDUCTED TO EVALUATE THE FUEL ECONOMY IMPROVEMENT POTENTIAL FOR EACH DEVICE IN PATROL SERVICE OPERATION. OTHER CONSIDERATIONS IMPACTING DEVICE SUITABILITY IN THIS APPLICATION ARE ASSESSED, INCLUDING AVAILABILITY, VEHICLE MODIFICATIONS REQUIRED FOR ADAPTATION, COST VERSUS VALUE OF FUEL SAVED, AND TIME FRAME FOR PRODUCTION IMPLEMENTATION. A COMPARATIVE EVALUATION OF DEVICES IS MADE AND THE CONCEPTS OF MAXIMUM MERIT ARE IDENTIFIED. A RECOMMENDED TEST PROGRAM FOR DEMONSTRATING THE PERFORMANCE OF THERE SYSTEMS IS PROVIDED. (AUTHOR ABSTRACT)