The fuel consumption of the car is particularly good when it is cold, and it is less and less when it is hot. What happened?

Temperature will reduce the thermal efficiency of gasoline. Experts said that in general, the engine needs to be maintained at room temperature, which is roughly 80℃-90℃. If the temperature is too high, the cooling system of the engine will automatically increase the water circulation speed of the cooling system, increase heat dissipation and take away excess heat; On the contrary, reduce the circulating speed of cooling water and keep the necessary temperature.

This is also the most basic cooling principle of the engine. Knowing this principle, it is not difficult to understand that the engine needs heat preservation rather than heat dissipation in cold weather. Due to the influence of flowing air, the temperature of the engine is not easy to keep around 80℃, and the engine will increase the fuel injection and change the "ignition advance angle" to keep the temperature. So cold weather will consume more oil than hot weather. Don't worry, it's normal.