How to Solve the Issue of Nissan Sunny Consuming 10L/100km?

3 Answers
Rachel
07/29/25 5:01pm
Here are the solutions for the Nissan Sunny consuming 10L/100km: 1. Tires: Fuel consumption is significantly related to tires. Generally, the larger the contact area between the tires and the ground, the stronger the grip. However, this also means greater frictional resistance. 2. Oxygen Sensor: The primary function of the oxygen sensor is to monitor the oxygen concentration in the exhaust. The vehicle's computer adjusts the fuel injection quantity in real-time based on the data it provides. It is usually installed near the three-way catalytic converter, divided into the front oxygen sensor and the rear oxygen sensor. 3. Carbon Deposit Issue: Carbon deposits inside the engine can cause unstable idle vibrations and reduced machine efficiency, leading to increased fuel consumption. Carbon deposits mainly adhere to areas such as the intake tract, intake and exhaust valves, piston tops, spark plugs, fuel injectors, and throttle valves. 4. Poor Driving Habits and Road Conditions: Poor driving habits are also a reason for increased fuel consumption. Examples include sudden acceleration, sudden braking, sudden stops, prolonged idling, speeding, frequent lane changes; for manual transmission vehicles, delayed gear shifting, and driving at high speeds in low gears, etc.
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SanArthur
08/14/25 7:09am
With over 20 years of driving experience, a sudden increase in fuel consumption to 10 liters per 100km is most likely due to driving habits. The classic Sylphy is inherently fuel-efficient, but aggressive driving with rapid acceleration and hard braking consumes significantly more fuel. Try adjusting your approach: gently press the accelerator when starting, maintain a steady speed, and use cruise control on highways; release the accelerator early to coast towards traffic lights instead of braking hard; avoid frequent lane changes in heavy traffic—all these can reduce fuel consumption. Also, ensure your car isn’t overloaded by clearing unnecessary items from the trunk; avoid running the AC at maximum constantly—open windows for ventilation when the weather permits. Stick to these habits for a week, and your fuel consumption should drop. If it remains high, further checks may be needed.
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GiselleLee
10/13/25 4:33am
Looking at your issue, a fuel consumption of 10L/100km is really quite high—it might be time for some proper maintenance. I've experienced similar situations myself; regularly changing the engine oil and air filter is crucial. If they're dirty or clogged, the engine can't intake enough air, leading to higher fuel consumption. The spark plugs should also be checked—if they're worn out and not igniting properly, fuel efficiency naturally drops. Low tire pressure is even worse, increasing rolling resistance and making the car consume more fuel. It's recommended to inflate them to the standard value. Also, don't overlook the battery condition and cooling system. If maintenance is delayed, these small issues can accumulate and drive up fuel consumption. Pay attention to your car's condition regularly and replace any necessary parts promptly—don't wait until problems become severe. If all else fails, take it to a repair shop to check for diagnostic trouble codes—it usually costs just a few hundred bucks to fix.
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