06 Audi a4 fuel consumption becomes lower when refueling.

The clutch surface is worn thin and the power is insufficient.

The reason is that the clutch surface is worn thin. Insufficient power leads to fuel consumption. The gap between spark plugs is relatively large, which leads to the lack of concentration of ignition energy and insufficient combustion of fuel. Dirty throttle leads to insufficient air intake and insufficient mixing ratio. The gasoline filter element is blocked. The carbon canister is blocked.

This will cause the cost of the vehicle. This should be checked and eliminated step by step. Cleaning the throttle is not simple cleaning. It is necessary to put the throttle and air intake. The intake valve of the engine should be cleaned. There is a special liquid for cleaning the throttle. That's detachable and cleaner.