Talk to the car owners about neutral gear, who is more economical to shift gears and roll the car?[汽车知识]

Let’s talk about which one is more economical in neutral gear or gear-shifting. Abandon the theory and return to reality. Recently, the forum has been rumored that gear-shifting is more fuel-efficient and safer than neutral-shifting.
As for the safety of gear-shifting, I admit this. From the perspective of braking, traction, flameout, etc., there is a certain degree of danger in neutral gear. But if you want to say that a neutral gear is more fuel-efficient than a geared one, then I definitely disagree.
Many of my friends quoted the classics before, and the theories they put forward are also very scientifically based. They are generally standard things in textbooks. The EFI car is indeed not the same as before.CarburetorThe car is in the idle state after neutral. The fuel consumption state at this moment is indeed better than that of the computer automatically cut off the fuel path when the gear is in gear. Another friend quoted Triumph’s real-time fuel consumption display system, indicating that the fuel consumption of a neutral gear was much higher than that of an in-gear one, which proved that a neutral-shift vehicle consumes more fuel than an in-gear one.
However, theory is theory after all. Comrade Xiaoping said that practice is the only criterion for testing truth. With all theoretical things, after a certain amount of practice, it is possible to discover some very superficial problems, but those who believe in theories are hard to find. I want to say that friends who are in gear and fuel-efficient are either very superstitious, or they are very new drivers.
Returning to this question, I only ask the brothers of the gear faction a very simple question. Have you tried it when driving? At a certain speed, such as 50 km/h. How far can you go in neutral, how far can you go in first gear, how far can you go in second gear, and how far can you go up to fifth gear?
First of all, theoretically, let’s say that I am now on a continuous gentle slope of 800 meters, and the slope is about 1000 meters flat and then red light.
In the first situation, I kicked the accelerator on the slope and put in neutral gear after 40 kilometers per hour. The vehicle speed increased slowly during the downhill process, and I even needed to step on the brake to control the speed. When I reached the bottom of the slope, the speed should be controlled at 60- per hour. After 80 kilometers, I switched to neutral and stopped at the red light after 1000 meters. During the entire 1800 meters, I didn't need to increase the accelerator. Except for the first throttle, it consumes fuel when idling for 1800 kilometers.
In the second case, I kicked the accelerator on the slope, put in 5 gears after 40 kilometers per hour, and then the vehicle speed is downhill. It is very likely that it will not increase or even decrease. Especially when there are unknown road conditions ahead, I will take it a little bit. PointBrake, It is very likely to go back to gear 4 and refuel. Then enter the flat ground, without refueling, 60 kilometers with 5 gears, how far do you think you can go? Can you reach the red light without gas? That is to say, from the top of the slope to the red light, you are likely to be constantly on the throttle, increase the speed, roll the car, and then increase the speed again, and then roll the car.
Let’s talk about flat ground. I’m probably at 60 speed and I can slip 800 meters in neutral, and then stop or downshift. If you have a gear, maybe the same 60 speed can only slip 200 meters, so I have to increase the accelerator. That is to say, I also slid the car. When in neutral, I can slid 800 meters from the red light, but it takes 200 meters to start slewing in 4th gear. Perhaps in the last 200 meters, your fuel consumption is indeed lower than in neutral, but in the first 600 meters, when you refuel in 4th gear, it consumes more fuel than neutral idle! !
Therefore, it is one-sided to refer to the instantaneous fuel consumption of Triumph to judge who is more fuel-efficient. Both Triumph and many theorists have forgotten to calculate the engine brake.According to the principles of physics, the effect of force is mutual. When in gear, there will be engine braking, and there will inevitably be resistance to lose you.CarWhere does the power come from? It is transformed from fuel consumption. From this simplest physical principle, the braking effect of neutral gear (only road resistance in neutral gear) is less than the braking effect of gear (engine braking should be considered when gearing), so there must be a power to come. To offset this extra braking, or the distance you glide must be much shorter. That is, with the same fuel consumption, you can only run a shorter distance. What should I do if I want to run the same distance as you? You know, when you hit the accelerator, you have already exceeded the idling fuel consumption for a long distance when you roll in neutral!