What is considered high fuel consumption for a car?

[DeIris]

The fuel consumption of a car depends on: 1. Engine: The fuel consumption index is an indicator of fuel economy, which determines whether a car has high fuel consumption. The level of the fuel consumption index also depends on the engine. 2. Transmission: The mainstream transmissions for family cars are dual-clutch transmission (DSG), manual transmission (MT), CVT transmission, and automatic transmission (AT). The lower the transmission speed, the lower the high-speed cruising speed, and the more fuel-efficient the car will be. 3. Total vehicle mass: Reducing the total mass of a car by one hundred kilograms can decrease fuel consumption by about 0.1L per 100 kilometers. 4. Ignition method: Except for new energy vehicles, choosing a diesel engine can save a lot of fuel compared to choosing a gasoline engine. This is because diesel engines have a relatively higher compression ratio, and fuel engines use lean mixture combustion, which eliminates losses in intake throttling, allowing higher thermal efficiency to be achieved with lower fuel consumption, resulting in significant fuel-saving effects.

[AnaAnn]

As a daily commuter car owner, I believe high fuel consumption mainly depends on personal experience and comparison. Every time I fill up the tank, I record the kilometers driven. If it used to run 500 km but now drops to 400 km, the fuel consumption has definitely increased. The manufacturer's reference data, such as around 8 liters per 100 km, if the actual measurement exceeds 10 liters, especially in stop-and-go city traffic without improvement, can be considered high. Using an app or simple calculation for fuel consumption is convenient: fuel amount divided by kilometers driven multiplied by 100. Driving habits like aggressive acceleration and frequent braking can skyrocket fuel consumption, which isn’t necessarily the car’s fault—adjusting driving style comes first. Low tire pressure or a dirty air filter can also waste fuel. By regularly checking these small details, I can keep fuel consumption within a normal range, avoiding wasted money and frustration.

[DeMaci]

From my perspective, fuel consumption should be judged based on the type of vehicle and usage scenario. For example, SUVs or older models typically range between 10-15 liters per 100 kilometers, while sedans are lower. I measure it practically: fill up the tank until the pump clicks, reset the odometer, drive 100 kilometers, then refill to calculate the amount. If the result is more than 20% higher than the average for the same model, or there's a sudden spike from a stable value (e.g., from 8 liters to 12 liters), then it's considered high. Cold starts in winter or short-distance driving naturally increase fuel consumption, which isn't abnormal. However, a continuous rise might indicate issues, such as carbon deposits affecting engine efficiency. Avoiding sudden acceleration and maintaining steady driving can effectively reduce fuel consumption. If your monthly fuel expenses increase by more than a hundred bucks, it's time to check your vehicle's condition or optimize your driving habits.

[CooperRose]

I usually pay attention to fuel consumption when driving, simply put, it means spending more on gas but driving less. The official data, such as 7 liters per 100 kilometers, is a baseline. If the actual measurement exceeds this by 15% or more, it's considered high. When refueling, note the distance traveled. If the mileage decreases significantly, for example, driving 100 kilometers less on a full tank, it means fuel consumption has increased. It's normal for urban driving to consume more fuel than highway driving, but if it remains consistently high, you should look into the reasons. Using better engine oil or maintaining tire pressure at 2.5 can save some fuel.

[ONatalie]

High fuel consumption affects not just the wallet, but also the car's overall performance. Normally, a car consumes 8-12 liters per 100 kilometers, and exceeding this range should raise a warning. I use OBD tools or manual calculations to confirm. High fuel consumption is often accompanied by abnormal engine sounds or sluggish acceleration, possibly caused by dirty air filters or fuel system malfunctions. Increased consumption in traffic jams is understandable, but persistently high levels warrant checking sensors or the ECU. Fuel-efficient driving techniques, like smooth starts, are crucial—they save money and protect the environment. I recommend a simple weekly check to spot trends early.

[Joel]

As someone who pays attention to car maintenance, I believe fuel consumption is relative to the vehicle's condition. First, compare actual measurements with the official values—if the difference is too large, it indicates a problem. For example, if the claimed consumption is 8 liters but the test shows 12 liters, it's considered high. Aggressive acceleration habits can increase consumption by 2-3 liters, which isn't a lasting abnormality. However, a sudden and sustained rise may be caused by aging spark plugs, tire wear, or an imbalanced air-fuel mixture. I perform regular maintenance, such as replacing filters, to prevent carbon buildup from affecting performance. In the city, 10 liters per 100 km is normal, while on highways, 8 liters is typical. If the difference is significant, promptly investigate potential faults. High fuel consumption not only wastes fuel but also damages the engine—addressing it early can prevent major repairs.