How much does fuel consumption increase for a 10-year-old car?

[RobertRose]

For many well-maintained cars, fuel consumption may only increase by less than one or two liters after ten years. Severe engine carbon buildup: Go to a 4S shop to clean the internal engine carbon deposits, clean the fuel injectors, clean the dirty intake manifold, remove the carbon layer on the exhaust valves, clean the dirty throttle body, and perform an ECU initialization calibration, then check the fuel consumption again. Solutions for high fuel consumption: Clean components like spark plugs and fuel lines. Check if the air filter is unobstructed. Check the ignition timing. Inspect the pipelines for any fuel leaks. If none of the above issues are found, check if black smoke is coming from the exhaust pipe after starting the car. Some suggest incomplete combustion; if the intake is fine, it might be due to excessive fuel injection.

[HaileyDella]

A car that has been driven for ten years typically experiences a 10% to 20% increase in fuel consumption, mainly due to wear and tear on engine components such as piston rings and valves. As the gaps widen, combustion efficiency decreases. Aging spark plugs or clogged air filters are also common issues, leading to insufficient fuel intake during each ignition. Many car enthusiasts have shared their data, reporting that their initial combined fuel consumption, say 8 liters, has now risen to over 9.5 liters, with even higher consumption during acceleration or uphill driving. Regular maintenance is key—replacing filters and engine oil can slow this trend, but don’t expect a complete return to the car's original condition. Fuel consumption spikes more noticeably in congested urban areas, so it’s advisable to conduct a comprehensive check annually to avoid unnecessary fuel expenses.

[EmilianoFitz]

The ten-year-old car I drive now consumes significantly more fuel than before, about 15% more than when it was new. I remember it used to be just around 7 liters per 100 kilometers when I first bought it, but now it easily exceeds 8 liters and occasionally emits smoke. The problem stems from my neglect of maintenance, such as underinflated tires increasing rolling resistance and overdue spark plug replacements, which make the engine work inefficiently. I advise fellow car owners not to repeat my mistakes. Check tire pressure monthly and replace the air filter annually to keep fuel consumption within a reasonable range. This not only saves on fuel costs in the long run but also reduces emission pollution.

[CharlotteFitz]

A 10-year-old car's fuel consumption increases by an average of 10-15%, with driving habits largely influencing this figure. Gently pressing the accelerator and avoiding sudden braking, along with regular oil changes to keep the engine running smoothly, can help control the increase. Stop-and-go city driving consumes more fuel than highway driving, so anticipating road conditions is crucial. Regular maintenance can maintain low fuel consumption, preventing the car from aging too quickly.