What Are the Reasons for High Fuel Consumption in Older Cars?
2 Answers
The main reasons for high fuel consumption in older cars are: 1. Fuel system issues: Poor fuel flow due to excessive carbon deposits causing blockages, leading to higher fuel consumption. 2. Spark plug failure: Spark plugs generally need replacement after 20,000 to 30,000 kilometers of driving. 3. Dirty air filter: A clogged air filter. 4. Open windows: Driving with all windows open in summer or using air conditioning in traffic jams. 5. Idling without turning off the engine: Prolonged idling without shutting off the engine or frequent ignition. 6. Frequent braking: Aggressive acceleration and frequent braking while driving. 7. Driving speed: Driving at high speeds in low gears or low speeds in high gears. 8. Incorrect engine oil: Using engine oil that does not meet the specified grade.
When I was driving my old car recently, I noticed a significant increase in fuel consumption. It might be due to excessive carbon buildup in the engine, as years of use have caused oil deposits to accumulate inside, leading to incomplete fuel combustion and wasted gas. Another major issue is the aging and less sensitive oxygen sensor, which is supposed to inform the computer about the fuel injection amount but now sends erratic signals, causing the engine to inject more fuel than needed. Additionally, the clogged air filter restricts airflow, forcing the engine to work harder to draw in air, naturally consuming more fuel. Low tire pressure is also a common pitfall—last week, I found the tire pressure was nearly 20% lower than it should be, and after inflating them properly, fuel efficiency improved immediately. Worn-out spark plugs also reduce ignition efficiency, causing unburned fuel to be expelled. I recommend regular engine cleaning and replacing the air filter to effectively lower fuel consumption and avoid draining your wallet. Also, practicing smooth driving with fewer sudden accelerations and decelerations can save a lot of fuel.
