All of the following are correct about four-when steering systems in cars EXCEPT: a. Improved high-speed handling. b. Improved maneuverability during parallel parking. c. Improved maneuverability during U-turns. d. Improved high-speed fuel economy.

The correct answer is d. Improved high-speed fuel economy.<br /><br />Four-wheel steering systems in cars are designed to improve handling and maneuverability, particularly at low speeds. They achieve this by allowing the front and rear wheels to turn in opposite directions, which enhances the vehicle's agility and stability during tight maneuvers such as parallel parking and U-turns. However, four-wheel steering systems do not directly contribute to improved high-speed fuel economy. Fuel economy is primarily influenced by factors such as engine efficiency, vehicle weight, and driving conditions.