With petrol prices in India touching the sky, every drop of fuel matters. It is frustrating when your bike suddenly starts drinking more petrol than usual. You might find yourself visiting the petrol pump more often, even though your daily travel distance hasn’t changed.
Many riders blame the bike manufacturer or the age of the vehicle. However, in most cases, low mileage is caused by small maintenance mistakes or bad riding habits. The good news is that most of these issues are easy to fix.
If you are worried about your bike’s poor fuel efficiency, here are the main reasons why it happens and what you can do about it.
1. Low Tyre Pressure
This is the most common reason for low mileage in India. When your bike tyres do not have enough air, they flatten slightly against the road. This increases “rolling resistance,” meaning your engine has to work much harder to move the bike forward.
If you ride with low air pressure for a week, you might see a significant drop in mileage.
- The Fix: Check your tyre pressure every week. Keep it at the level recommended by the company (usually mentioned on the bike’s chain cover or owner’s manual).
2. Dirty Air Filter
Your bike’s engine needs a mix of air and fuel to run. The air filter acts like a mask, stopping dust and dirt from entering the engine. In Indian cities, there is a lot of dust, which clogs the air filter quickly.
When the filter is blocked, the engine struggles to breathe. To compensate, it burns more fuel to keep running. A dirty air filter can drop your mileage by a large margin.
- The Fix: clean your air filter during every service. If it is too dirty, replace it immediately. It is a cheap part but saves a lot of money on petrol.
3. Old or Bad Engine Oil
Engine oil acts as a lubricant that allows internal parts to move smoothly. Over time, this oil becomes thick and dirty. When the oil is old, it creates more friction inside the engine. The engine then has to use more power (and more petrol) to overcome this friction.
Using the wrong grade of oil can also harm your mileage.
- The Fix: Always change your engine oil on time. Do not delay servicing by more than 500 km from the scheduled date.
4. Wrong Gear Shifting & Clutch Habits
How you ride matters as much as the condition of the bike. Many riders in heavy traffic have a habit of riding the clutch (keeping the clutch lever half-pressed while riding). This wastes a lot of fuel.
Similarly, riding in a lower gear at high speed raises the engine RPM unnecessarily. On the other hand, riding in a high gear at a very low speed (knocking the engine) also puts stress on the engine and wastes fuel.
- The Fix: Shift gears according to your speed. Release the clutch fully after changing gears.
5. Dry or Loose Chain
The chain connects your engine power to the rear wheel. If the chain is dry, rusty, or too loose, power is lost before it reaches the wheel. This mechanical drag forces the engine to burn more fuel to maintain speed.
- The Fix: Lubricate your bike chain every 500–700 km. Get the chain tension adjusted by a mechanic if it feels loose.
6. Worn Out Spark Plugs
The spark plug is responsible for igniting the fuel inside the engine. If the spark plug is old or covered in carbon deposits, the fuel will not burn properly. This leads to “incomplete combustion,” where petrol is wasted without producing power.
- The Fix: Check spark plugs during every service. They generally need replacement every 12,000 to 15,000 km, depending on the bike model.
7. Modifications and Accessories
Young riders often install wide tyres, heavy crash guards, or loud aftermarket exhausts. While these look good, they add extra weight to the bike. Wider tyres increase friction, and heavy accessories make the engine work harder.
- The Fix: Avoid unnecessary modifications if mileage is your priority. Stick to stock tyres and lightweight accessories.
What Should You Do Next?
If you have checked all the points above and your mileage is still low, there might be a deeper issue like a carburetor tuning problem or a tight brake pad dragging on the wheel. Visit an authorized service center for a full check-up.
Frequently Asked Questions (FAQs)
Q1: Does the quality of petrol affect bike mileage?
Yes. Adulterated or poor-quality petrol can reduce mileage and harm the engine. Try to fill petrol from trusted and busy petrol pumps.
Q2: Can I improve mileage by switching off the engine at signals?
Yes. If the traffic signal is red for more than 20 seconds, switch off your engine. Idling burns fuel without taking you anywhere.
Q3: How often should I check tyre pressure?
It is best to check it once a week. Also, check it when the tyres are cold (before riding) for an accurate reading.
Q4: Does sudden braking reduce mileage?
Yes. Sudden braking means you wasted the speed you built up using fuel. Then, you have to accelerate again, using more fuel. Smooth riding is the key to good mileage.
Q5: Will synthetic oil improve my bike mileage?
Synthetic oil is smoother and lasts longer, which can slightly improve engine performance and mileage, but it is more expensive than regular oil.