Which gear should be used for automatic transmission cars on highways?

[JeremiahLee]

For automatic transmission cars on highways, the D gear is used. The specific reasons are as follows: 1. The D gear is usually the forward gear, and acceleration is performed according to the set program for upshifting, which is relatively more fuel-efficient. It is recommended not to use the S gear for long periods on highways, as the S gear only delays upshifting without changing other working conditions, which will inevitably increase the transmission load and temperature in a short time, leading to accelerated wear. 2. Moreover, the comfort of the vehicle in S gear mode is slightly worse, so try to avoid using the S gear for extended periods. The D gear is the forward driving gear used in most automatic transmission cars, with some designed with a sequence from 1st gear to high gear, and others from 2nd gear to high gear. When driving, simply place the gear lever in the D gear, and the speed of the car will be controlled by the throttle.