The ideal explosion temperature of gasoline is 95 degrees, so when the water tank is very cold, more gasoline is injected. Idle speed will also be high and natural fuel consumption is high, this is normal. So, try to reduce short trips in winter.
It should also be noted that in the winter, the warm wind should be turned on after the water temperature has risen. If the car is very cold, the warm air will absorb the temperature of the water tank and slow down the temperature rise of the water tank. It also indirectly increases fuel consumption.