Which gear to use for automatic transmission on highways?

[EdenMarie]

For automatic transmissions, use the highest D gear when driving at high speeds. The specific gear depends on the number of gears the vehicle has. Different models have varying numbers of gears. For example: with a 5-speed automatic transmission, the highest gear is D5; with a 6-speed automatic transmission, it's D6. About automatic transmissions: These vehicles don't require manual gear shifting by the driver - simply keep the gear in D position as the car automatically shifts based on current speed. For overtaking, maintaining high RPM is better achieved using S (Sport) mode, though this increases fuel consumption. About S gear: S stands for Sport mode. Many models call this the sports mode. Engaging S gear delays upshifts or prompts early downshifts to keep engine RPM higher, increasing torque output for greater power. When driving at high speeds, always maintain proper speed control and avoid exceeding speed limits.