Hello: Regarding your inquiries, many factors will affect fuel consumption, such as driving habits, driving conditions, oil, carbon deposition, and maintenance. First of all, you can clean up the carbon deposits of the throttle body, fuel injectors, and intake passages.
In the case, too much carbon in these parts will lead to increased fuel consumption. Secondly, check whether the electronic control system is faulty. You can use the diagnostic computer to check whether the signals of various sensors are normal, such as water temperature sensors, oxygen sensors, and intake pressure sensors.
The misalignment of these sensor signals will affect the fuel consumption of the vehicle. The use of spark plugs can be removed and inspected. Generally, it can be replaced at an interval of 30,000 kilometers. Too much fuel consumption requires thorough inspection.