
Fourth gear corresponds to a speed range of 40-60 km/h. The speed ranges for manual transmission gears are as follows: 15 km/h for 1st gear, 25 km/h for 2nd gear, 35 km/h for 3rd gear, and 65 km/h for 5th gear. Below are some related details about gear usage: Relationship between gears and speed: Generally, start in 1st gear and shift to 2nd gear after traveling a few meters. When the speed reaches above 20 mph but below 35 mph, shift to 3rd gear. When the speed reaches above 35 mph but below 45 mph, shift to 4th gear. When the speed exceeds 45 mph, shift to 5th gear. The above applies to standard 5-speed transmission cars. For cars with 6 or more gears, you can upshift one gear for every additional 15 mph increase in speed. Additionally, when shifting gears, pay attention to the engine RPM; it's best to shift when the RPM is around 2500. Introduction to gear usage: Most cars have 5 forward gears and 1 reverse gear, with neutral in the middle. Use 1st gear for starting; 2nd gear for speeds between 20-40 km/h; 3rd gear for speeds between 40-60 km/h; 4th gear for speeds between 60-75 km/h; and 5th gear for speeds above 75 km/h.

After driving for so many years, I've seen quite a few manual transmission cars. The speed in fourth gear usually ranges between 60 to 90 km/h, depending on the car's displacement and power. Generally, in the city, I prefer shifting to fourth gear when the speed stabilizes around 60 km/h, keeping the engine RPM between 2000 to 3000, which is more fuel-efficient and smoother. On the highway, fourth gear can even push beyond 100 km/h, but it's not recommended as it strains the engine at high RPMs. It's best to on actual driving feel—when the engine sounds too loud, it's time to shift up or down. Getting the shift timing right not only extends the car's lifespan but also saves a lot on fuel. Experienced drivers know every car is different, so try it out with your own ride.

I just got my driver's license and asked several experienced drivers about the speed range for 4th gear in a manual transmission. They all said it's not fixed, but generally 50 to 70 km/h is appropriate. I tried it in my own small car - driving in 4th gear in the city is too slow and causes shaking, while going too fast is unsafe. They recommend beginners first familiarize themselves with the tachometer; shifting at 2000 to 2500 RPM is most reliable. Additionally, shifting into 4th gear at too low speed may cause stalling, while doing so at high speed wastes fuel. If in doubt, have a professional mechanic check the gear ratio and engine condition. Most importantly, maintain focus while driving to ensure safety and comfort.

As a car enthusiast, I often pay attention to details when driving a manual transmission. The speed range in fourth gear is greatly influenced by engine power. For regular family cars, operating in fourth gear is smoothest around 60 to 80 kilometers per hour, corresponding to 2500 to 3500 RPM, where maximum power and efficiency are achieved. If you've modified the exhaust or added a turbo, you might push it faster, but don't take risks with a stock car. I've tried it on the track, but for daily driving, efficient gear shifting is recommended to avoid excessive acceleration that could damage components. Choosing the right shift points can elevate the driving experience to another level.

I drive a manual transmission car to work every day, and fourth gear is mainly used on suburban roads or highway entrances, at speeds of about 50 to 70 kilometers per hour. During commuting, this gear is very practical—it's smoother than third gear and less strenuous than fifth gear, making it most comfortable to drive at around 60 kilometers per hour. There are significant differences between car models; smaller cars like the Fit feel more agile, while larger vehicles like SUVs are a bit slower. It's advisable to adjust based on actual road conditions—don't rush to shift to higher gears in traffic jams, and shift to fourth gear earlier when the road is clear to save fuel. Make it a habit to check the gear condition to ensure smooth and worry-free driving.

I pay special attention to fuel efficiency and environmental protection when driving. For manual transmission in 4th gear, I recommend maintaining a speed between 60 to 80 km/h, as this is when the engine operates at peak efficiency with minimal fuel consumption. Long-term testing has shown that keeping the RPM between 2200 to 3000 is ideal—it avoids wasteful idling and prevents excessive revving that leads to higher emissions. The optimal range may vary slightly between different models, such as Toyota's hybrids or Ford's performance vehicles, but the core principle remains the same: selecting the right speed for gear shifts protects the engine and reduces carbon footprint. Remembering proper shift timing ensures both economical and safe driving.


