A STUDY WAS CONDUCTED TO SEE IF RELATIVE FUEL ECONOMY ADVANTAGES EXIST FOR A CERAMIC TURBINE ENGINE WHEN IT IS DOWNSIZED FOR A SMALL CAR. A 75 KW (100 HP) SINGLE-SHAFT ENGINE CURRENTLY UNDER DEVELOPMENT WAS ANALYTICALLY DOWNSIZED TO 37 KW (50 HP) AND ANALYZED WITH A METAL-BELT CONTINUOUSLY VARIABLETRANSMISSION IN A SYNTHESIZED CAR. WITH GASOLINE, A 25-PERCENT ADVANTAGE WAS CALCULATED OVER THAT OF A CURRENT SPARK-IGNITION ENGINE, SCALED TO THE SAME POWER, USING THE SAME TRANSMISSION AND CAR. WITH DIESEL FUEL, A 21-PERCENT ADVANTAGE WAS CALCULATED OVER THAT OF A SIMILAR DIESEL-ENGINE VEHICLE.