Is it better to use D gear or S gear when driving on the highway?

[MacLawson]

It is better to use D gear when driving on the highway, while S gear is used for aggressive driving and overtaking. Precautions for driving on the highway include: 1. Both the driver and front-seat passenger should fasten their seat belts, and the driver should not answer phone calls; 2. Avoid making sudden steering wheel movements while driving at high speeds; 3. Do not change lanes arbitrarily while driving. When changing lanes or overtaking the vehicle ahead, the turn signal must be activated in advance; 4. Only adjacent lanes are allowed for overtaking, and the vehicle should immediately return to the driving lane after overtaking. Vehicles must not straddle or drive on the lane divider line; 5. Do not reverse, drive in the opposite direction, make U-turns or turns by crossing the central divider, conduct test drives, or drive training vehicles. Overtaking and parking on ramps are also prohibited; 6. Maintain a following distance of at least 100 meters. When the speed is below 100 kilometers per hour, the distance from the vehicle ahead in the same lane can be appropriately reduced, but the minimum distance should not be less than 50 meters.

[AsherLynn]

I've been driving for over 20 years and frequently travel on highways. I can confidently say that using D mode is the most reliable option. D mode is like an automatic cruise control - the transmission maintains low RPMs, the engine runs smoothly, and fuel consumption is low, saving significant money on long trips. I only use S mode for emergency overtaking since it increases RPMs for faster acceleration, but it's completely unnecessary when there aren't many vehicles on flat highways. Frequent use of S mode can cause engine overheating and increased wear. On highways, I always use D mode - it's both safe and comfortable. The dashboard shows fuel consumption at just over 6 liters per 100km, making it the most economical choice.

[CamilleLee]

I'm quite passionate about driving and love the feeling of being pushed back into my seat. However, I usually use D mode on highways because it's more convenient. S mode has a more aggressive power response—stepping on the throttle sends the RPM soaring, making overtaking incredibly quick. It's exhilarating to occasionally switch to S mode in heavy highway traffic, but it consumes at least 1 liter more fuel per 100 km, making it unsuitable for long distances. Most of the time, I stick with D mode, where the RPM stays stable around 2000, ensuring a quiet and comfortable ride without constantly worrying about refueling. On highways, maintaining speed is what matters most—no need to sacrifice your wallet and comfort for thrills.

[Gabriel]

I commute 50 kilometers on the highway every day, mostly using D mode. It automatically shifts gears to maintain smooth driving, with low cabin noise making the drive less tiring. S mode revs too high for highway cruising and is unnecessary unless briefly needed for a quick acceleration to pass slower vehicles ahead, but avoid frequent use as it drastically increases fuel consumption. When traffic is light on the highway, setting D mode at 80 mph is effortless—the transmission is well-optimized for steady-state driving like this. Safety comes first; maintaining stable speed and minimizing gear changes is the smart choice.

[GraceLynn]

I drive very fuel-efficiently and always use D gear on the highway. D gear keeps the engine running at the optimal RPM, with highway fuel consumption around 5 to 7 liters. S gear delays gear shifts to enhance power response but often keeps RPM above 3000, increasing fuel consumption by 20%, making it uneconomical for long-term use. For example, when driving from Beijing to Shanghai, I only use one tank of fuel with D gear, but switching to S gear would require two refuels. There's no need to bother with S gear when cruising steadily at 80 mph—D gear is designed for efficient cruising, saving money and being eco-friendly. Regular transmission maintenance is recommended to prevent malfunctions.

[EleanorMarie]

I know a bit about car technology. For high-speed driving, prioritize using D (Drive) gear. In D gear, the transmission logic is optimized to lower engine RPM and improve fuel efficiency. At a steady speed of 100 km/h, the engine runs smoothly at 1500 RPM, saving fuel. S (Sport) gear delays upshifts to maintain higher RPM for enhanced acceleration, but this increases friction losses and raises fuel consumption by 15%. Prolonged use of S gear at high speeds carries a risk of engine overheating. Switching to S gear occasionally for overtaking is fine, but sticking to D gear daily protects the car and reduces maintenance costs. Practical tests confirm this as the most reasonable approach.