The fuel consumption of cars has increased. Is it necessary to clean the throttle?

The fuel consumption of the car has increased, and the throttle must be cleaned.

Two possibilities. First: dirty throttle is equivalent to partial blockage, and the intake air will be small. ECU injects fuel according to the air intake, so it should be more fuel efficient. Second: If there happens to be only one dirty spot, if the throttle is opened a little wider, the air intake will indeed increase and the fuel injection will also increase. In this case, the power output will increase and the idle speed will also increase, and the fuel consumption during normal driving will not be affected.