What is the reason for the high fuel consumption after battery replacement?

Car batteries have a certain service life and need to be replaced after expiration, but many car owners find that their car fuel consumption has increased. So what is the reason for the high fuel consumption after changing the battery?

The reason why the fuel consumption of a car is high after battery replacement is because the positive and negative poles of the battery need to be disconnected, and the information originally stored in the ECU will be automatically reset after power failure, and the fuel consumption will increase after battery replacement continues to drive.

However, after changing the battery, the fuel consumption suddenly increased, which is temporary, and the owner does not need to care too much; After the ECU and TCU of the car are relearned, the fuel consumption will naturally return to the level of replacing the battery before; In fact, not only will the fuel consumption of the car increase after replacing the battery, but the fuel consumption of the car will also increase after cleaning the carbon deposit on the throttle. These are normal phenomena, but don't worry, it will return to normal after a while.