Why is the fuel consumption high when the engine is working normally?

[DiMiranda]

There are several reasons for high fuel consumption when the engine is working normally, including tire factors, excessive engine carbon deposits, and a damaged oxygen sensor. Tire factors: Tires are relatively easy to inspect, so they should be checked first. If the tire pressure is insufficient, fuel consumption will increase. If the tire pressure is normal, then check the degree of tire wear. When the tires are severely worn, frequent slipping can occur, which also increases fuel consumption. Excessive engine carbon deposits: If there is a significant buildup of carbon deposits in the engine over a short period, it can also lead to higher fuel consumption. This situation is often caused by the use of substandard fuel. The solution is to add a certain amount of cleaning agent when refueling. If the effect is not noticeable, it indicates a substantial amount of carbon deposits in the engine. In this case, it is best to take the vehicle to a 4S shop or repair shop for professional cleaning of the engine's carbon deposits by a technician. Damaged oxygen sensor: The oxygen sensor, as an internal control unit of the car, primarily monitors the air-fuel ratio of the engine. If it is damaged, it will cause an imbalance in the engine's air-fuel ratio, inevitably leading to abnormally high fuel consumption. When driving, the exhaust pipe may emit darker-colored exhaust gases. In such cases, the oxygen sensor should be replaced as soon as possible.

[WyattDella]

Having driven for over a decade, I've found that high fuel consumption with a normally functioning engine is quite common, mainly due to insufficient maintenance or aging parts. For example, a clogged air filter accumulates dust, restricting air intake and causing the engine to consume fuel inefficiently, wasting fuel unnecessarily. Spark plugs degrade over time, leading to poor ignition and incomplete fuel combustion, naturally increasing fuel consumption. Additionally, carbon buildup in the fuel system's injectors can cause inaccurate fuel spraying, leading to excess fuel usage, or a faulty oxygen sensor can mislead the computer into over-fueling. Moreover, excessive carbon deposits in the engine increase friction and reduce efficiency. These minor issues may not seem to affect driving but waste money. It's advisable to check the air filter monthly, replace spark plugs annually, clean carbon deposits before long trips, and use diagnostic tools at repair shops for quick fixes. Prevention is better than cure; regular maintenance saves the most money.

[MalachiMarie]

As a working professional who frequently commutes by car, I also reflect on my driving habits when experiencing high fuel consumption. Driving too fast or accelerating aggressively by stomping on the gas pedal consumes a lot of fuel because the engine has to work harder to overcome increased air resistance and accelerate combustion. Frequent hard braking similarly wastes energy recovery opportunities. In the city, with numerous traffic lights and stop-and-go traffic, it's difficult to save fuel. I've also noticed that running the air conditioner at maximum or driving short distances in cold weather before the engine warms up leads to inefficient performance. Insufficient tire pressure increases ground friction, making the car harder to move and consuming more fuel. Changing habits, such as avoiding rapid starts and stops, maintaining a steady speed around 80 km/h, reducing highway driving, and setting the air conditioner to a moderate temperature, can help. Monitoring fuel gauge changes to identify causes can gradually reduce fuel consumption—small daily habits make a big difference.

[MaggieLynn]

Over years of family car use, I've found abnormal fuel consumption is often caused by external factors. Excessive loading, such as a fully packed trunk or a full car of passengers, increases engine load and fuel consumption. Frequent cold starts in winter and short trips prevent the engine from reaching optimal operating temperature, leading to higher fuel usage. Running the AC in summer, especially at high speeds, significantly increases energy consumption due to the compressor's demand. Insufficient tire pressure, often from infrequent checks, increases rolling resistance and rapidly boosts fuel consumption. Simple ways to avoid these include controlling load to avoid overloading, planning trips to reduce short journeys, regularly checking and maintaining proper tire pressure, and minimizing AC use at maximum settings in hot weather. Small daily adjustments can save significant fuel costs and benefit the environment.