Why does fuel consumption suddenly increase after a full tank?
2 Answers
The main reasons for a sudden increase in fuel consumption after filling up the tank are: 1. Spark plugs: If the spark plugs deteriorate, age, or become clogged, it can directly affect the complete combustion of fuel, leading to a significant increase in gasoline consumption. 2. Fuel quality: Poor-quality fuel can result in incomplete combustion, preventing the vehicle from delivering its intended power. To achieve sufficient power, drivers may need to press the accelerator harder, naturally increasing fuel consumption. Therefore, it is recommended that car owners choose reputable gas stations when refueling. 3. Overloading: Driving with the vehicle in a long-term overloaded state.
Having driven for over 20 years, I've frequently encountered sudden fuel consumption spikes after refueling. The main reasons are: 1) Changed driving habits - the psychological effect after refueling makes drivers feel the car has more power, leading to deeper throttle presses and more aggressive acceleration, naturally increasing fuel consumption. 2) Increased vehicle weight - a full tank adds dozens of liters of gasoline, with each liter weighing nearly 1kg, adding dozens of kilograms to the total weight, making the car work harder. 3) Mileage calculation errors - resetting the trip meter after refueling may show sudden consumption increases if road conditions differ or previous records had errors. Note: While lower temperatures increase consumption, this isn't related to refueling. Recommendation: Maintain gentle driving for a few days after refueling, avoiding rapid acceleration, and monitor if consumption normalizes. Persistently high consumption may indicate engine issues requiring attention.
