What are the causes of abnormal car fuel consumption?

[SanJasper]

Car fuel consumption abnormalities are caused by: 1. Temperature fluctuations affecting fuel consumption, which is normal. Generally, in winter when temperatures are low, fuel consumption increases slightly, almost comparable to summer air conditioning usage. This occurs because lower temperatures cause the engine to dissipate more heat; 2. Lack of regular vehicle maintenance, where dirty engine oil and air filters can also lead to increased fuel consumption; 3. Worn-out spark plugs needing replacement; 4. Insufficient tire pressure; 5. Incorrect data from certain sensors, such as the coolant temperature sensor and oxygen sensor; 6. Excessive carbon buildup in the vehicle. Fuel consumption, commonly referred to as the amount of fuel consumed per 100 kilometers driven, is a key economic indicator of a vehicle, represented mainly by fuel consumption, and is an important performance metric in vehicle usage.