Car-holding knowledge of cars - driving can not be so fuel-efficient

High-speed engine operation is often misunderstood by some drivers who believe it can save fuel. This is a complete misconception. When an engine operates at its rated power, the speed is at its peak, but so is fuel consumption, which increases linearly with speed. This relationship can be clearly seen on the engine's external characteristic curve. Therefore, running the engine at high speeds is not only inefficient but actually leads to the highest fuel consumption. Additionally, prolonged high-speed operation accelerates mechanical wear and reduces the engine’s lifespan. On the other hand, some drivers mistakenly think that low-speed operation saves fuel. To achieve this, they may shift into higher gears too early or drive in low gears for long distances, causing the engine to "lug" or run under heavy load. In situations where the vehicle is heavily loaded, forcing it into a higher gear to lower engine speed can lead to unstable RPM, severe knocking, reduced power, and even increased fuel consumption. Thus, simply reducing engine speed does not result in fuel savings. In fact, driving at a moderate speed is the most efficient and safest option, as it balances fuel economy with engine longevity. Another common mistake is slamming the accelerator during cold starts. This not only causes excessive wear on the cylinder walls but can also lead to serious damage such as piston scuffing or bearing failure. During a cold start, engine components are not fully lubricated, and sudden throttle inputs cause erratic engine speed and uneven load distribution. This results in repeated impacts between the piston and cylinder wall, accelerating wear on the piston rings, pins, and bearings. After a cold start, the engine should idle for a few minutes to allow proper lubrication. In winter, when starting is more difficult due to low temperatures, slightly pressing the throttle or revving the engine briefly while idling is both safe and fuel-efficient. Some drivers try to save fuel by accelerating quickly and then coasting, repeating this cycle multiple times. However, this method is inefficient because rapid acceleration forces the throttle to open wide, significantly increasing fuel consumption. Proper fuel efficiency comes from smooth acceleration and gradual deceleration, avoiding abrupt changes in speed. Coasting should be done responsibly, not as a way to force the engine into low-load conditions. Finally, using kerosene mixed with gasoline is a dangerous practice that does not save fuel and can severely damage the engine. It can cause detonation, abnormal noises, power loss, and black smoke. If too much kerosene is added, it may even make the engine hard to start or cause it to stall after starting. Unburned kerosene can also contaminate the engine oil, making it thin and deteriorating its performance, leading to bearing damage and increased wear. In short, mixing kerosene with gasoline negatively affects the vehicle's performance, economy, and overall lifespan.

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