Why does the average fuel consumption increase from 9L to over 30L?

[OLyla]

Average fuel consumption increasing from 9L to over 30L may be caused by engine carbon deposits affecting fuel efficiency. The longer the engine operates, the more carbon deposits accumulate inside, significantly reducing combustion efficiency and increasing fuel consumption. Here are the specific reasons: 1. Prolonged engine idling: Extended periods of idling may seem like low engine speed and minimal fuel consumption. However, since the vehicle remains stationary, the onboard computer calculates higher average fuel consumption. Additionally, prolonged idling leads to incomplete fuel combustion, resulting in carbon deposits. Frequent idling noticeably increases engine carbon buildup, worsening fuel economy. 2. Sudden braking and acceleration: During rapid acceleration, the combustion chamber has more fuel and less air, creating an oxygen-deficient environment. This incomplete combustion produces excessive hydrocarbons, and the resulting drag counteracts some of the vehicle's momentum, increasing fuel consumption. 3. Frequent lane changes and irregular driving: Vehicles consume more fuel when turning than driving straight due to increased resistance. Frequent lane changes, overtaking, and merging all contribute to higher fuel consumption.

[VonGenesis]

After driving for so many years, I've seen cases where fuel consumption suddenly skyrockets, mostly due to internal car issues. If the oxygen sensor is faulty, the computer misreads data, causing the engine to inject more fuel. Faulty fuel injectors may also leak, wasting fuel unnecessarily. Worn-out spark plugs failing to ignite properly drastically reduce combustion efficiency. Additionally, low tire pressure increases rolling resistance, and a dirty air filter restricts airflow, both dragging down fuel economy. The most troublesome is when the engine control module malfunctions, incorrectly adjusting fuel delivery and directly doubling fuel consumption. It's advisable to visit a professional shop immediately to scan for trouble codes—don't delay, as continued driving will only burn more money.

[KiraFitz]

I usually drive quite fuel-efficiently, but suddenly the consumption has risen to over thirty liters. I suspect this might be due to external factors. For example, frequently crawling in congested areas with constant stop-and-go traffic is the most fuel-intensive. Or when temperatures drop sharply, the air conditioning and heating work overtime, increasing the engine load. There are also driving habit issues like carrying too much cargo, frequent sharp accelerations on mountainous roads. If there are many short trips, the increased number of cold starts also consumes more fuel. Sometimes the onboard computer miscalculates, such as after an oil change or if the battery wasn't reset. First, record a few days of driving to see if it persists. If it remains consistently high, it's time to check the vehicle.

[OTucker]

Encountering a sudden surge in fuel consumption? Start with simple self-checks. Measure the tire pressure of all four tires—if it's low, inflate them promptly. Open the engine compartment to inspect the air filter; replace it if it's too dirty. For older vehicles, pay attention to the spark plugs—replace them if they appear burnt or blackened. Check the exhaust pipe for any signs of oil leakage, as fuel line leaks are often visible to the naked eye. Finally, restart the vehicle's infotainment system to reset it. If the issue persists, it's advisable to visit a workshop to read the data stream, focusing on injection pulse width and oxygen sensor values. Addressing these minor issues yourself can save time and effort, resolving most small problems.

[LeVivienne]

Fuel consumption skyrocketing from 9L to over 30L makes it a money-burning machine, with monthly fuel costs potentially increasing by thousands. It's not just the wallet that suffers—exhaust emissions also double, polluting the environment, especially when driving in urban areas, harming both others and oneself. I've noticed many people neglect regular maintenance, like failing to replace the three filters on time, which leads to extra fuel consumption. Improper modifications, such as recklessly flashing ECU programs, can also disrupt the factory tuning. Developing habits like frequently checking tire pressure and cleaning carbon deposits, using public transport combined with short-distance electric vehicles in cities, saves fuel and is eco-friendly. In the long run, it's worth it for both your wallet and the planet.

[MakaylaDella]

Abnormally high fuel consumption may indicate underlying faults. Severe carbon buildup blocking the intake tract, or piston ring wear causing oil burning can both drag performance. More covert issues include transmission slippage and delayed upshifting, forcing the engine to work harder as if climbing a hill. Abnormal fuel pump pressure or a stuck return valve leading to excessive fuel injection, along with ECU misreading data, can also falsely report high consumption. Occasional battery disconnections may cause lost adaptation values requiring relearning. Never underestimate a single faulty sensor - the entire vehicle system is interconnected where one issue affects all. Don't neglect prompt professional diagnostics, as both safety and your wallet are at stake.