What is the fuel consumption difference between 2WD and 4WD?

[MacFernando]

Under the same vehicle model and engine displacement conditions, 4WD models consume approximately 0.4-0.8 liters more fuel per 100 kilometers compared to 2WD models. The reasons for increasing fuel consumption in vehicles are as follows: 1. Fuel consumption fluctuations due to temperature influence: Generally in winter when temperatures are low, fuel consumption increases somewhat, almost comparable to fuel consumption when using air conditioning in summer. This is because low temperatures cause the engine to dissipate more heat. 2. Prolonged lack of vehicle maintenance: Dirty engine oil and air filters can also lead to increased fuel consumption. Dirty oil results in poor lubrication, causing increased resistance in various moving parts of the engine, which requires more energy to overcome, thus increasing fuel consumption. 3. Spark plugs need replacement: Spark plugs are often overlooked. Although they may still function, insufficient ignition energy can cause delayed ignition, missing the optimal ignition timing.