What Causes a Sudden Increase in Fuel Consumption for an Audi at 60,000 Kilometers?

[Jones]

Excessive engine carbon buildup is a significant reason. Severe engine carbon deposits: Carbon deposits typically form on the fuel injectors, spark plugs, throttle valve, and combustion chamber. When carbon buildup reaches a certain level, it can cause difficulty in ignition. Use of low-quality fuel: Since low-quality fuel contains more impurities, it cannot burn completely, leading to most of the gasoline being expelled from the vehicle. Additionally, a white or reddish-brown layer forms on the surface of the oxygen sensor, causing misjudgment in measuring the oxygen content in the exhaust. This results in incorrect feedback data, ultimately affecting the proper control of the fuel injection ratio. Excessive vehicle load: Carrying too many unnecessary items in the vehicle can increase its weight. Some drivers prefer to fill the fuel tank to the brim, which also adds to the vehicle's weight. The heavier the load, the greater the pressure on the tires against the ground, leading to increased tire friction.