Excessive Fuel Consumption in Vehicles: What Could Be the Causes?

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Driving normally, but why is the fuel running out faster? Let's find out the reasons why that could be! 

Just seeing the fuel prices makes us hesitate to refuel, and if our car starts consuming fuel faster than before, our wallets are sure to feel the effects. 

When a car consumes more fuel than usual, it is often due to abnormalities within various components of the vehicle. Let's take a closer look at which points need special attention. 

Air Filter

If the air filter is heavily clogged, it can restrict the airflow into the engine. This leads to incomplete combustion of fuel, resulting in incomplete burning and higher fuel consumption. You can notice this by observing black smoke or the smell of unburned fuel coming out of the exhaust pipe. 

Spark Plugs

For gasoline or gas-powered engines, worn-out spark plugs can lead to incomplete combustion of fuel or gas. This can result in inefficient burning and a decrease in acceleration and engine power. 

Fuel Injectors

If the fuel injectors are clogged, they may not be able to spray fuel as a fine mist. This can lead to incomplete combustion, causing unburned fuel to exit the exhaust. As a result, more fuel or gas than usual may be required, leading to increased fuel consumption. This can be noticed by observing black smoke from the exhaust. 

Tyre Pressure

If the tyre pressure is too low, you will need to press the accelerator pedal harder to achieve the desired speed. This increased effort can lead to higher fuel consumption. Conversely, if the tire pressure is too high, the tires may not grip the road properly, affecting handling and fuel efficiency. Therefore, it's important to maintain the proper tire pressure for optimal performance and fuel efficiency.

Engine Belt

The engine belt is responsible for transferring power from the engine to various components. If the engine belt is too loose, it can result in incomplete engine operation. On the other hand, if it's too tight, the engine may be subjected to excessive strain.

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Regularly checking the coolant level in the radiator is essential. If the coolant has deteriorated or becomes rust-coloured, it can lead to the engine overheating and excessive fuel consumption due to accelerated combustion.

 Engine Oil / Oil Filter

Both engine oil and the oil filter have a limited lifespan and should be changed according to the recommended distance or time interval. Prolonged use of engine oil can result in thickening, making it unable to lubricate the pistons effectively. This can lead to sluggish acceleration, increased fuel consumption, and potential damage to internal components.

Air Conditioning Temperature

Setting the air conditioning temperature too low can cause the system to work harder to achieve the desired cooling effect. It's advisable to adjust the temperature to a moderate level, as excessively low temperatures can lead to increased strain on the system and higher fuel consumption.

Driving Behaviour

Our driving behaviour also plays a significant role in fuel consumption. Sudden acceleration or frequent abrupt braking can not only lead to higher fuel consumption but also cause increased wear and tear on various components. These actions can result in shorter component lifespans and potentially contribute to accidents.


It's important to load the vehicle according to its capacity, as overloading can lead to increased fuel consumption. When a vehicle is overloaded, it requires more power to move, which in turn results in higher fuel consumption.

We hope this article helps you reduce the factors that contribute to excessive fuel consumption in your vehicle, whether it's to a lesser extent or more. If anyone knows of additional causes that lead to increased fuel consumption, feel free to comment and share your recommendations!

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