Mercedes Mullins
There are many factors that can cause a car's fuel consumption to increase. Some of the most common reasons include aggressive driving habits such as speeding, rapid acceleration, and sudden braking. Other factors include external conditions such as temperature and driving environment, as well as the internal workings of the vehicle, such as tyre pressure, engine health, and the use of air conditioning. Additionally, the viscosity grade of engine oil and regular maintenance can also impact fuel efficiency.
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What You'll Learn
Poor maintenance
One of the most important aspects of car maintenance is keeping your tires in good condition. Old tires lose their traction on the road, forcing them to spin more to maintain speed and consuming more fuel. Under-inflated tires can also decrease traction and increase the number of times the tires have to rotate to cover the same distance, leading to decreased fuel efficiency. Therefore, it is crucial to maintain optimal tire pressure as recommended by the manufacturer.
Another key area of maintenance is regularly changing your engine oil. Using the wrong motor oil can lead to greater fuel consumption as the pistons and other movable parts of the engine may not move as freely. It is important to consult your car's owner's manual or a dealership to determine the right quality and viscosity grade of engine oil for your vehicle.
In addition, poor maintenance of the engine can lead to increased fuel consumption. This includes issues such as a faulty oxygen sensor, which can give bogus readings that throw off the fuel mixture, or a faulty alternator, which can place a significant load on the engine. Other problems may include clogged air filters, leaking fuel injectors, or a faulty fuel pump or clogged fuel lines.
Finally, some maintenance issues may be specific to older cars. For example, very old cars may lack knock sensors, and using low-octane fuel in an engine designed for high-octane fuel can cause damage and potentially lead to increased fuel consumption.
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Driving habits
Firstly, avoid frequent short trips, especially in cold weather. Short trips of only 15 minutes or so can bring down your fuel economy because your engine works most efficiently when it's fully warmed up. Cold temperatures also mean that your car takes longer to warm up to the correct operating temperature, and it spends less time at the desired temperature. Instead of taking multiple short trips, consider how you can complete more errands in one outing and drive to the furthest location first.
Secondly, avoid aggressive driving, which usually consists of hard braking, accelerating too quickly, and stopping too suddenly. This forces your vehicle to switch gears faster than what is optimal for good fuel economy. Instead, accelerate slowly, drive with the speed of traffic, and maintain a safe distance from the vehicle in front of you to avoid sudden stops. A natural, brakeless deceleration, where possible, can help increase fuel efficiency. Driving at a steady speed is more fuel-efficient, so when driving on the highway, use cruise control to maintain a constant speed.
Thirdly, avoid speeding and overloading your vehicle. Speeding reduces your fuel economy by up to 30% on the highway. Driving faster creates more air resistance, which means your engine has to work harder. Staying within the speed limit can increase your fuel efficiency. Similarly, overloading your vehicle with heavy items in your trunk or cargo hold will decrease your fuel economy. The added weight means your engine has to work harder to bear the extra weight.
Finally, be mindful of your tyre conditions and the use of air conditioning. Poorly inflated or old tyres with low traction can decrease fuel efficiency as they have to spin more to maintain a certain speed. Additionally, using the air conditioning can put a lot of strain on your engine and hurt fuel efficiency, especially on hot days. However, when driving at high speeds, it is more fuel-efficient to use air conditioning instead of opening the windows, as this creates more aerodynamic drag, reducing fuel efficiency.
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Tyre pressure
Tyres that are not inflated correctly can cause added friction while driving due to their distorted shape. This means your engine has to work harder, using more fuel to maintain the same speed and keep your car running smoothly. Old tyres can also lose their traction on the road, causing them to spin more, which in turn consumes more fuel.
To improve fuel efficiency, it is important to maintain the optimal tyre pressure recommended by the manufacturer. You can use a simple tyre pressure gauge to check each tyre's pressure, ideally before turning on your car for the day as cool tyres give the most accurate reading. If you notice that your tyres look visibly underinflated, you should refill them as soon as possible.
Additionally, tyres above 15 psi may require extra precautions when inflating, such as using a tyre inflation cage or a clamping mechanism, to ensure your safety. It is also important to be aware of your surroundings and stand outside the potential explosion trajectory of the tyre. By regularly checking your tyre pressure and maintaining the correct inflation, you can help improve your car's fuel economy and ensure safer driving.
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Engine oil
One of the main causes of increased fuel consumption due to engine oil is using the wrong type of oil for your car. The viscosity grade of engine oil plays a crucial role in fuel efficiency. If the oil is too thin, it can lead to fuel dilution and wear of the piston ring liner. On the other hand, if the oil is too thick, it can cause excessive friction, making it harder for the pistons and other movable parts of the engine to move freely. This increased friction puts additional stress and pressure on the engine, resulting in higher fuel consumption. Therefore, it's essential to consult your car's manual or a dealership to determine the correct viscosity grade and type of engine oil for your specific vehicle.
In addition to using the right type of oil, regular oil changes are crucial for maintaining fuel efficiency. Over time, engine oil can break down and lose its effectiveness, leading to increased fuel consumption. By changing your engine oil at the recommended intervals, you can ensure optimal performance and prevent excessive fuel usage.
Another factor that can contribute to high oil consumption is mechanical problems within the engine. Issues such as worn turbocharger bearings or a blocked oil return line can cause engine oil to be sucked into the combustion chamber and burnt along with the air-fuel mixture. This results in increased oil consumption and can lead to combustion faults and engine damage. Therefore, it's important to address any mechanical issues promptly and ensure that your engine is well-maintained.
Lastly, it's worth noting that some engines are simply designed to consume more oil than others. Modern engines have made significant improvements in this regard, with the latest industry specifications offering better LSPI (Low-Speed Pre-Ignition) protection. However, it's still common for engines, even newer ones, to consume a certain amount of oil during their service life. As a result, it's important to regularly check your engine oil levels and top them up as needed to ensure optimal performance and fuel efficiency.
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Short trips
Another way to mitigate the impact of short trips on fuel consumption is to plan your journeys efficiently. Consider how you can complete more errands in one outing and drive to the furthest location first. Combining several small trips into one larger one can improve your car's fuel economy and save time.
Aggressive driving habits, such as hard braking and acceleration, can also contribute to higher fuel consumption on short trips. These actions force your vehicle to switch gears faster than optimal, increasing fuel usage. Instead, maintain a steady speed, avoid excessive braking, and accelerate slowly. Driving with the speed of traffic and leaving enough space between you and the car ahead can help you avoid sudden stops. Additionally, driving at a constant speed with the use of cruise control in automatic cars can further improve fuel efficiency.
Finally, regular car servicing and maintenance are crucial for optimising fuel efficiency during short trips. Proper maintenance ensures that your engine is working smoothly and efficiently. This includes keeping an eye on your tyres, as underinflated tyres can increase rolling resistance, leading to higher fuel consumption. Other maintenance tasks such as regular oil changes, tune-ups, and replacing old tyres can also improve engine performance and fuel mileage.
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