Good gasoline mileage is a result of a carefully developed vehicle, high quality fuel, and sound maintenance.
A gradual improvement in gasoline has permitted more efficient engines. Highest engine efficiency is achieved by utilizing the maximum useful compression ratio, and by meticulous tailoring of carburetors, distributors, cooling systems, and other components to each engine model. Because these components are closely matched and are subject to deterioration in service, good maintenance is a primary part of obtaining all of the gasoline mileage that was built into the fleet vehicle.
