Why Does Fuel Consumption Increase?

[DylanAnn]

Excessive carbon deposits in the car engine, excessive air conditioning load, and untimely cleaning of dust on the car body. The following is a related introduction to the increase in vehicle fuel consumption: 1. Excessive carbon deposits in the car engine: The operation of a car cannot be separated from the combustion of gasoline. Gasoline inevitably contains some impurities, and long-term accumulation will form a certain amount of carbon deposits and sludge on the engine surface, which is harmful to the engine. It can easily lead to difficulties in starting, high idle speed, excessive exhaust emissions, and other issues, and will further increase the car's fuel consumption. 2. Excessive air conditioning load: Summer is the peak period for air conditioning use. After prolonged use, dust can easily accumulate in the air conditioning system, not only breeding bacteria but also causing unpleasant odors in the cold air blown out, which will further increase the car's fuel consumption. 3. Untimely cleaning of dust on the car body: The biggest resistance a car encounters while driving is air. If there is too much dirt and dust on the car body, it will increase the resistance during driving. The resistance caused by the dust on the car body will significantly increase the car's fuel consumption.

[DelJaxson]

Having driven for over a decade, I've found that unexplained increases in fuel consumption are usually related to driving habits. For example, with the recent hot weather and constant air conditioning use in traffic jams, fuel consumption can be two to three units higher than usual. Or it could be low tire pressure—last time I didn't notice a slow leak, and it cost me an extra liter per 100 kilometers. Another scenario is carrying too much unnecessary weight, like two crates of bottled water sitting untouched in the trunk for six months—basically driving around with dumbbells every day. Many also overlook engine oil condition; overdue oil becomes as thick as syrup, making the engine work harder. I recommend checking these areas first. If nothing stands out, then look into parts like the oxygen sensor—after all, replacing one could cost several tanks of fuel.

[OJaxon]

Car enthusiasts seeing a sudden spike in fuel consumption first suspect aging mechanical parts. Last time my car suddenly consumed 2 liters more per 100 km, and the culprit turned out to be worn-out spark plug electrodes, leading to poor ignition efficiency and incomplete fuel combustion. Another hidden villain is the carbon canister purge valve – if it sticks, fuel vapors from the tank go wild. A clogged air filter resembling a thick carpet is also common, forcing the engine to gasp for air and guzzle fuel. The most troublesome issue is oxygen sensor poisoning – after refueling with substandard gasoline, it sends wrong data, making the ECU stupidly spray excessive fuel. These components are particularly vulnerable in older cars, so a comprehensive check-up at 60,000 km is recommended.

[VonJasper]

Last month, the displayed fuel consumption suddenly jumped from 7.5 to 9.2. Upon reflection, I realized it was due to my neglect of maintenance. The maintenance manual recommends replacing the air filter every 20,000 km, but I delayed it until 35,000 km. When removed, the filter was completely clogged with willow catkins. The engine oil level had long dropped to the minimum mark, and insufficient lubrication caused increased engine load. Even more foolish was the tire pressure—all four wheels were only at 1.8 bar, making the car feel like it was trudging through mud. I also discovered that the trunk had been carrying a folding bed and camping gear for a long time, adding at least 50 kg of extra weight. After addressing these basic issues, the fuel consumption dropped back to 7.8 within three days. So, just like people, regular upkeep saves money in the long run.

[DelEthan]

Ladies, pay attention! Your car turning into a gas guzzler might be due to overly gentle driving. My bestie used to be afraid of stepping on the gas pedal to avoid damaging the car, but long-term low-speed driving caused a toothpaste-like sludge buildup in the throttle. Also, running the AC with the outside air circulation on is like driving with the windows down while the AC is on. Choosing wider tires might look good, but 225-width tires have significantly more rolling resistance than the factory 195s. The most unfair part was filling up at cheap, small gas stations with low-quality fuel full of impurities that don’t last. Now, I take a monthly highway drive to clear carbon deposits, keep tire pressure at 2.5, and only refuel at reputable stations—my fuel consumption is even lower than when I first bought the car.

[VanessaFitz]

Don't rush to repair your car for abnormal fuel consumption. Check these minor issues first: Have you removed the fitness equipment from the trunk in time? High summer temperatures increase gasoline volatility, directly causing a 3% fuel loss. For every 10°C drop in tire temperature, tire pressure decreases by 0.07; neglecting checks for two months can result in a 0.3 loss. Worn-out wipers increase wind resistance, equivalent to strapping a delivery box on the roof. Additionally, insufficient coolant leading to high engine temperature prompts the ECU to forcibly increase fuel injection for cooling. Addressing these seemingly unrelated details might save you from costly major repairs.