How to solve the fuel consumption problem of Tiida?

07 Tiida, fuel consumption suddenly increased, go to the repair shop to replace the air flowmeter, spark plug, carbon canister, and clean the throttle three-way catalyst. The computer detects that the data flow is normal, and the fuel consumption remains high, which is 1. 1 yuan/km. Ask the great god for guidance! Thank you. 07 Tiida (see transaction price | model details), the fuel consumption suddenly increased, so go to the repair shop to replace the air flowmeter, spark plug, carbon canister and clean the throttle three-way catalyst. The computer detects that the data flow is normal, and the fuel consumption remains high, which is 1. 1 yuan/km. Ask the great god for guidance! Thank you. There are several reasons for high fuel consumption of vehicles: 1. Insufficient tire pressure and tire wear. Insufficient or too low tire pressure will increase the friction between the tire and the ground, increase resistance and increase fuel consumption. When tires are seriously worn, they will often slip and fuel consumption will increase. 2. Pay attention to the quality when refueling and clean up the carbon deposits regularly. Inferior gasoline will increase carbon deposition, too much carbon deposition will make the intake pipe wall rough, affect the intake effect and the quality of mixed gas, and make the fuel consumption rise sharply. Therefore, the quality of gasoline can not be ignored, and it is essential to clean up the carbon deposit once every six months. 3. Check the oxygen sensor regularly. This is a ceramic element located on the exhaust pipe of the engine, which is used to detect and control the ratio of oxygen to fuel. After long-term use, the computer of electronic fuel injection system can't get the information of oxygen concentration in the exhaust pipe, and the mixture concentration in the engine is often high, which will increase fuel consumption. Therefore, it is necessary to check the condition of the oxygen sensor regularly. Generally, it is necessary to replace @ 2010/9 every 8-10000 km.