What causes the Passat's average fuel consumption to exceed 30 liters?
2 Answers
The reasons for high car fuel consumption include abnormal tire pressure or switching to larger-sized tires; idling for long periods without turning off the engine or frequent ignition; aggressive acceleration and frequent braking while driving; driving at low gear with high speed or high gear with low speed; fully open windows in summer or using air conditioning during traffic jams; not planning the route well, driving on congested roads, and frequently changing lanes. The combined fuel consumption of the Passat is 5.8-6.7L/100km. There are currently 10 Passat models on sale. The 280TSI Business Edition and Elite Edition have a combined fuel consumption of 5.8L/100km. The 330TSI Elite Edition, Starlight Elite Edition, Luxury Edition, Starlight Luxury Edition, Starlight Premium Edition, and Premium Edition have a combined fuel consumption of 6.3L/100km. The 380TSI Luxury Edition and Flagship Edition have a combined fuel consumption of 6.7L/100km. The above figures are NEDC combined fuel consumption, which is the fuel consumption data measured under the NEDC test procedure. The actual fuel consumption is higher than this value, ranging from 8.0-9.1L/100km. Methods to reduce fuel consumption: Clean engine carbon deposits: Excessive engine carbon deposits are a significant cause, mainly due to using unsuitable fuel. It is recommended to add a certain amount of cleaning agent when refueling. If the effect is not obvious, it indicates a high level of carbon deposits in the engine. In this case, the car must be taken to a 4S shop for professional technicians to clean the carbon deposits inside the engine. Check the oxygen sensor: As an internal control unit of the car, the oxygen sensor mainly monitors the fuel-air ratio of the engine. Once damaged, it will cause an imbalance in the fuel-air ratio, leading to a sudden increase in fuel consumption. After the oxygen sensor is damaged, the exhaust pipe will emit darker-colored exhaust gas during driving, and the oxygen sensor should be replaced at this time. Regularly replace the three filters: During vehicle use, the oil filter, air filter, and fuel filter must be replaced regularly. If not replaced for a long time, they will become dirty and send incorrect information to the engine control unit, resulting in incomplete fuel combustion and increased engine carbon deposits. Check the electronic control unit: Although the engine's electronic control unit is highly reliable, in older vehicles, various faults are inevitable.
As a veteran driver with over a decade of experience, I'm no stranger to the sudden surge in Passat's fuel consumption to over 30 liters. The most common causes are severe engine carbon buildup or clogged fuel injectors, leading to incomplete fuel combustion and a sharp drop in engine efficiency. Faulty oxygen sensors causing an overly rich air-fuel mixture, or aging spark plugs with poor ignition, can also make the car guzzle fuel like crazy. Don't overlook driving habits, such as frequent hard acceleration or prolonged high-speed driving, and insufficient tire pressure that increases friction resistance. Running the AC at full blast or vehicle overloading also drinks fuel like water. I strongly advise you to head to a 4S shop for a comprehensive check-up immediately. Don't delay—this issue not only burns money but also poses safety risks. Regular maintenance can save you major headaches.
