Rajan Wilcox
Reducing fuel consumption in a petrol car can save you money and reduce your environmental footprint. There are several ways to achieve this, including driving less, walking or biking instead, and carpooling. When driving, accelerating gently and maintaining a constant speed will help, as will keeping your car well-maintained and removing unnecessary items to reduce weight. Keeping your tyres inflated and using cruise control can also reduce fuel consumption, as can turning off the air conditioning and opening windows only at slower speeds.
| Characteristics | Values |
|---|---|
| Avoid harsh braking | Every time you use your brakes, you waste your forward momentum. |
| Maintain a safe distance from the vehicle in front | This will help you avoid sudden braking and reduce fuel consumption. |
| Use cruise control | This will help you maintain a constant speed and reduce fuel consumption. |
| Avoid harsh acceleration | The harder you accelerate, the more fuel you use. |
| Maintain speed | Your car requires more energy to increase speed than it does to maintain it. |
| Avoid speeding | Vehicles use more fuel at higher speeds. |
| Remove unnecessary items from your car | The lighter the vehicle, the less fuel it requires. |
| Remove roof racks, roof boxes, bull bars, and extended wing mirrors | These items increase drag and reduce fuel economy. |
| Keep your tires inflated | Underinflated tires increase rolling resistance and reduce fuel efficiency. |
| Regular car servicing | This helps maintain your engine's fuel efficiency. |
| Use engine oil | Engine oil helps reduce friction in the engine and improve fuel economy. |
| Use lubrication | Lubrication reduces friction and improves fuel economy. |
| Use the auto-stop/start feature | This can help improve fuel economy by up to 10%. |
| Walk, bike, or carpool when possible | This is the easiest way to reduce fuel consumption. |
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What You'll Learn
Reduce drag and wind resistance
The main driver for lower aerodynamic drag is fuel economy. The faster you go, the more drag matters. At 70 mph, you've got four times the force working against your vehicle than you do at 35 mph. The higher the speed, the greater the influence that aerodynamic resistance has on fuel consumption.
Automakers rely on computer software and wind tunnels to ensure vehicles meet their aerodynamic targets. Race car engineers were among the first to analyse the interaction between the airflow around a vehicle and the resulting effects on performance. This analysis led to the design of aerodynamic features for race cars in the 1960s.
To reduce drag, the boundary layer (the section of slow-moving air located very close to the body of the car) should be as thin as possible. The surface of the car should be highly polished and clean, reducing the amount of friction that the boundary layer can exert on the car. Other small protrusions, such as screws, hinges, and gaps in the bodywork, should be minimised to reduce drag created from skin friction.
Items such as roof racks, roof boxes, bull bars, and extended wing mirrors can also increase drag and affect your vehicle's aerodynamics. Removing them when not in use will improve fuel economy.
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Keep tyres inflated
Keeping your tyres inflated to the proper pressure is one of the most important things you can do to reduce fuel consumption. Under-inflated tyres can increase rolling resistance, causing your engine to work harder and burn more fuel. If all your tyres are under-inflated by 10 psi, your fuel efficiency could decrease by up to 10%. Under-inflated tyres can lower your gas mileage by about 0.2% for every 1 psi drop in average pressure. Conversely, properly inflated tyres are safer, last longer, and can improve your gas mileage by 0.6% on average and up to 3% in some cases.
You can find the correct tyre pressure for your vehicle in the owner's manual, or it may be printed on a sticker in the driver's side door jamb or the glove box. It's important to note that you should not use the maximum pressure printed on the tyre's sidewall. A tyre with 25% of its air let out can still look like a fully inflated tyre, so it's recommended to use a tyre gauge to check.
Maintaining optimal tyre pressure will not only save you money at the pump by reducing fuel consumption but also improve your vehicle's performance and decrease the risk of tyre failure. It's one of the most common aspects of a car that drivers neglect, but it's essential for keeping you and other road users safe.
In addition to keeping your tyres inflated, regular car servicing and reducing the weight of your vehicle by removing unnecessary items from your boot or trunk can also help to improve fuel efficiency.
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Remove unnecessary weight
The weight of a car directly impacts its fuel consumption. The heavier the vehicle, the more fuel it requires to move. Therefore, removing unnecessary weight from your car can significantly improve its fuel efficiency.
Start by removing any unnecessary items from your boot, trunk, or back seats. Every extra 50 kg reduces fuel efficiency by 2%. This includes emergency spares, which should be kept to a minimum, and any other items you usually keep in your car. If you have items such as roof racks, roof boxes, bull bars, or extended wing mirrors that you don't regularly use, consider removing them. These items can increase drag and negatively impact your vehicle's aerodynamics, leading to higher fuel consumption.
You can also reduce weight by removing the rear seats and package tray, which can be easily done without tools and reversed if needed. If you're willing to go further, consider removing the entire heating and air conditioning system, which can save around 5 kg. Additionally, look into removing the stereo, speakers, and any other entertainment systems, as these can add significant weight.
Another way to reduce weight is to downsize certain components. For example, switching to a smaller car battery can reduce weight by up to 50%. You can also replace heavy glass windows with lightweight alternatives like Lexan or plexiglass, but ensure that this complies with local laws. Finally, consider the weight of your fuel tank. For shorter trips, you don't need a full tank, so filling it only halfway can reduce the amount of unnecessary liquid you're carrying.
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Use cruise control
Cruise control is a feature found in most modern vehicles that allows you to set a desired speed for the car to maintain automatically. Once activated, a system takes control of the throttle and keeps the car at a steady pace without the need for continuous input from the driver. This can be particularly useful when driving at a consistent pace on open roads and highways, as it minimises unnecessary acceleration and braking that tend to waste fuel.
Using cruise control can be an effective way to improve fuel efficiency, especially when driving at moderate speeds. It helps maintain a constant speed, which optimises fuel consumption by reducing the number of engine revolutions per minute (RPM). This is because your car requires more energy to increase speed than to maintain it, so limiting the rate at which you gain speed can increase the distance you travel for every litre or gallon of fuel used.
However, it's important to note that the impact of cruise control on fuel consumption can vary depending on driving conditions. For example, using cruise control in heavy traffic or on winding roads with multiple inclines and declines may not be the most fuel-efficient choice due to frequent acceleration and deceleration. In these situations, manual control can be more efficient as it allows you to make informed decisions based on road conditions.
Additionally, some vehicles offer adaptive cruise control (ACC), an advanced extension of the conventional feature. ACC automatically adjusts the vehicle's speed to maintain a safe distance from the car ahead, further enhancing safety and reducing the risk of rear-end collisions. This technology can be particularly useful when tackling uphill climbs, as it can adjust throttle inputs and gear ratios more efficiently, optimising fuel consumption and power output during ascents.
Overall, while cruise control can be a valuable tool for improving fuel efficiency, it should be used judiciously depending on the driving scenario and the specific capabilities of your vehicle's cruise control system.
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Regular car servicing
A car engine has various moving parts, and any friction between these parts can be detrimental, requiring more energy for the engine to overcome. Lubrication reduces friction and helps increase fuel economy while also improving the life of your vehicle. During a service, the technician will replace the engine oil and filter, ensuring optimal lubrication. This reduces internal friction, allowing the engine to run more efficiently and consume less fuel.
Other fluids such as transmission fluid, coolant, and brake fluid are also checked and topped up if necessary. It is important to keep your fuel system in good condition as it plays a crucial role in delivering fuel to the engine efficiently. Over time, fuel injectors can become clogged with deposits, affecting their spray pattern and hindering fuel atomization. Regular servicing allows for the early detection and resolution of potential issues that may negatively impact fuel efficiency. For instance, a faulty oxygen sensor may cause the engine to run rich, resulting in increased fuel consumption. Detecting and replacing a faulty sensor during a service helps restore optimal fuel-air mixture and efficiency.
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Frequently asked questions
The best way to reduce fuel consumption is to drive less. If your destination is within walking or biking distance, consider leaving your car at home.
Keep your car well-maintained. Regular car servicing can help maintain your engine's fuel efficiency. Keep your tires inflated to the recommended pressure and remove any unnecessary items from your car to reduce its weight.
Aggressive driving behaviors like speeding, sudden braking, and rapid acceleration can increase fuel consumption. Driving at a constant speed, avoiding hard braking, and accelerating gently can help reduce fuel consumption.
Yes, using the air conditioning can increase fuel consumption. It is recommended to use the air conditioning sparingly and consider alternative methods to keep your car cool, such as opening the windows at slower speeds.
If your car has cruise control, make use of it, especially when driving on highways or flat roads. Cruise control helps maintain a constant speed, reducing the need for acceleration and braking, thus lowering fuel consumption.
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