Why does it consume more fuel in winter?

Reason 1: Decreased stability and efficiency of engine combustion.

In winter, low temperatures can have a negative impact on the stability and efficiency of engine combustion. When cold air comes into contact with cold fuel, the combustion stability and efficiency can significantly decrease. This is because low temperatures cause an increase in the density of diesel fuel, resulting in longer fuel spray distances. As a result, the diesel fuel droplets have a higher probability of colliding with the cylinder walls during the combustion process, which reduces the overall combustion efficiency, as the cylinder walls are known to have the lowest combustion efficiency within the combustion chamber. Additionally, cold air can also cause a delay in combustion, leading to lower combustion pressure and temperature.

Reason 2:  the time it takes for the engine to reach normal operating temperature is longer.

During cold weather conditions, the time it takes for the engine to reach its normal operating temperature increases. As the engine gradually warms up, fuel consumption decreases with rising temperatures. The prolonged warm-up time means that the overall fuel consumption will be higher.

It is important to note that increasing the water temperature in the engine also means increasing the temperature of the cylinder walls. To achieve optimal fuel efficiency, it is necessary to avoid having a low water temperature (cylinder wall temperature), regardless of the season.

Reason 3: Whether the selection of engine oil is correct

An important indicator of engine oil consumption is the 100℃ kinematic viscosity, which refers to the temperature of the oil when the engine is running normally and the water temperature reaches 80℃. The lower this index is, the more fuel consumption can be saved while ensuring lubrication effect. Therefore, choosing the correct oil in winter is crucial for reducing vehicle fuel consumption.

Reason 4: low tire adhesion

In winter, the road is covered with snow and ice, the tire adhesion will be reduced accordingly, which also leads to increased fuel consumption.