How long can the average fuel consumption of Buick LaCrosse come down when cleaning the throttle?

After cleaning the throttle, the fuel consumption returns to normal after driving100km as long as it matches:

1. After cleaning the throttle, the fuel consumption will generally increase obviously in a short time. 2. This is because the original throttle has carbon deposit, which disappears after cleaning, and the air intake increases, and the fuel consumption will also increase. 3, it can be stabilized for a period of time or reset by computer matching, and the fuel consumption can return to normal.