What is the reason for Max's high fuel consumption?

The reasons for high fuel consumption are: 1, not maintained: the oil of the vehicle has not been maintained for a long time, and the air filter is dirty, which leads to an increase in fuel consumption. 2. Aging: The engine spark plug is aging, and there are many carbon deposits, which affect the ignition effect and lead to high fuel consumption. 3. Insufficient air pressure: Insufficient tire air pressure will increase the contact area between the tire and the ground, resulting in greater driving resistance and higher fuel consumption. 4. Excessive carbon deposition: Where there is carbon deposition, there is too much carbon deposition anywhere in the throttle, injector, air inlet and piston top, which will lead to incomplete combustion and increase fuel consumption.