What do you think if the car is fuel-efficient? How to choose?

Nowadays, many people will pay attention to the fuel consumption level of the model when buying a car. How to judge whether it consumes fuel or not? Some people say to look at the official fuel consumption data, some say to look at the displacement, and some say that good driving habits will naturally save fuel. But in fact, this is not the case in actual use. So how do you see if the car is fuel-efficient? How to choose?

Whether a car is fuel-efficient or not can be judged by just looking at one or two aspects. When we understand a car, we usually find the car configuration table, the engine parameters, technology, fuel consumption of the Ministry of Industry and Information Technology, gearbox, tires, etc. Wait, these are important factors that affect the actual fuel consumption of a car.


For the same type of engine, the small displacement naturally has an advantage in fuel consumption. For engines with similar displacement, it mainly depends on the technology, such as direct injection, high compression ratio, VVT, etc. These technologies are very helpful for fuel economy, and the external assistance has the function of engine start and stop. Generally speaking, the newer the technology, the lower the fuel consumption level.

What do you think if the car is fuel-efficient? How to choose?

If you choose a small-displacement engine below 1.6L, the weight of the vehicle will have a relatively large impact on the fuel consumption of the vehicle. If it is too heavy, it will easily cause the phenomenon of “small horse-drawn cart”, but it will consume more fuel. Theoretically speaking, for every 100kg reduction in vehicle weight, the fuel consumption per 100 kilometers will decrease by about 0.1L. Therefore, for supercharged or self-priming engine models with small displacement, it will be more fuel-efficient to choose a vehicle with a small weight.

So is it true that the larger the displacement, the more fuel it consumes? This is not absolute. Because many small-displacement models are low-end cars with relatively old technology, the problem of outdated technology will also lead to high fuel consumption. And many people will worry about fuel consumption when they see a car with relatively high maximum power and peak torque. In fact, this has no direct relationship. It will be more fuel efficient. Personally, I think that whether to use supercharging technology will not change the overall fuel consumption of a car too much. It mainly changes the performance of various working conditions. Low-speed and high-speed cruise, but if the speed is changed frequently, it will consume more fuel than self-priming.


At present, a large part of automatic transmission models with better fuel consumption performance are equipped with CVT and dual-clutch gearboxes. Instead of the energy-wasting hydraulic transmission of traditional automatic transmissions, a CVT uses new technology to improve fuel efficiency. The dual-clutch reduces power loss through faster shifting speeds and improves engine output utilization, which can also reduce fuel consumption. However, the CVT sorts out the power quite smoothly, and some people who like intense driving will not feel it; while the low-speed frustration and reliability of the dual-clutch have always been its flaws.

What do you think if the car is fuel-efficient? How to choose?

Some people think that choosing a manual transmission model will be more fuel-efficient, but this argument is outdated. The manual transmission fuel-saving theory is mainly aimed at the 4AT gearbox with older technology in the past. Now, even some AT models can achieve the same fuel consumption level as the manual transmission. Rather, some CVT models are even better than manual transmission. However, manual transmission still has the advantages of low maintenance cost and high reliability, so many taxis use manual transmission, not because of fuel economy.

tire size

What do you think if the car is fuel-efficient? How to choose?

The amount of fuel consumption is how much fuel is needed to drive the car, and the car needs to overcome resistance, and a large part of this resistance comes from the road surface. As the only contact part between the car and the road, tires have a great impact on fuel consumption. The larger the contact surface between the car and the ground, the greater the friction and the higher the fuel consumption, so wider treads will increase the fuel consumption level. When a car runs at a constant speed of 100km/h, it is mainly affected by three kinds of resistance: air resistance, friction between internal parts of the car and rolling resistance of tires, of which the rolling resistance formed by tires accounts for 25%.

Ministry of Industry and Information Technology Fuel Consumption

What do you think if the car is fuel-efficient? How to choose?

Many people understand that there is actually a gap between the fuel consumption of the Ministry of Industry and Information Technology and the actual situation, because most of the fuel consumption data is sampled from the best fuel consumption results, not the average value. But it does not mean that there is no reference. The fuel consumption value of the Ministry of Industry and Information Technology is 1-2L higher, which is actually close to the actual fuel consumption.


In fact, fuel consumption is not the only basis, especially the difference in fuel consumption level is 1-2L/100km. If it is used normally, there will be a difference of tens or hundreds of fuel costs in a month. If you choose some models with lower performance and comprehensive level It’s not necessary anymore.

Content source: Che Zaocha, author Liu Zitao.