There are two reasons for good fuel consumption in winter: 1. In winter, the temperature is low, the air density is high, and the air resistance is high, because most of the energy consumed by cars is to overcome the air resistance. 2. The low-temperature lubricity of solid lubricating oil in each rotary bearing becomes worse, which leads to the increase of rotational resistance. In winter, the engine consumes heat quickly, the temperature of engine and water tank rises slowly, cold start, idle speed of hot car and low speed driving are the main reasons for increasing fuel consumption.
The main reason is that the temperature is low in winter, and the engine needs to maintain a constant working temperature and inject more fuel. When the air conditioner is not turned on in summer, the outside temperature is very high, so the radiator can't exchange heat with the outside environment sometimes, and even the fan needs to intervene to dissipate heat. More than 400 degrees, the temperature below zero goes in at once, and it is difficult to be heated to more than 800 degrees in high temperature environment (the gas exchange speed is fast), which directly leads to the incomplete combustion of fuel and the failure to reach the optimal working temperature. These two reasons are the reasons why the fuel consumption in winter is higher than that in summer.
Need to warm up before driving, preheating depends on fuel consumption. When the temperature is low in winter, the preheating time will be longer and the fuel consumption will be greater. It is understandable to warm up the car in winter, mainly to make all parts fully lubricated by engine oil. In addition, when driving at high speed, the engine body will dissipate heat faster because of air intake. In addition, warm air will be used in the car, so the engine will do more work than usual to ensure normal operation, and it is normal to have higher fuel consumption.