This car consumes more and more fuel. What happened?

Here are the reasons for the increase in automobile fuel consumption: 1. Fuel consumption will fluctuate due to the influence of temperature. Generally, when the temperature is low in winter, the fuel consumption will increase, which is similar to that of turning on the air conditioner in summer. This is because the temperature is low and the heat emitted by the engine increases. 2. The vehicle has not been maintained for a long time, and the dirty oil and air filter will also lead to an increase in fuel consumption. Dirty oil will lead to poor lubrication and increase the resistance of all moving parts of the engine. More energy is needed to overcome resistance and fuel consumption will increase. It's time to replace the spark plug. Spark plugs are easily overlooked, and some people haven't changed them for more than 100 thousand kilometers. Although the spark plug can continue to be used at the end of its life, it will delay ignition and miss the best ignition time because of insufficient ignition energy. 4. Insufficient air pressure. Insufficient air pressure will increase the contact area between the tire and the ground and increase the friction, that is, the driving resistance will increase and the fuel consumption will increase. 5. Some sensors have incorrect data, such as water temperature sensor and oxygen sensor. The sensor is not completely damaged, but the data is inaccurate and the fault light will not light up. It is difficult to find out whether the data stream is not detected by the computer. 6. The vehicle has too much carbon deposit. There are throttles, fuel injectors, air inlets and piston tops where carbon is deposited. Too much carbon deposition anywhere will lead to incomplete combustion and increase fuel consumption.