Katerina Swanson
Diesel engines are more fuel-efficient than gasoline engines of a similar size, but there are still ways to improve fuel economy. This can be achieved through behavioural changes, modifications, or a combination of both. Behavioural changes include driving style adjustments, such as limiting acceleration and maintaining a steady speed, particularly between 30 and 48 mph, where possible. Modifications include installing aftermarket equipment to reduce drag, using premium fuel and lubricants, and maintaining optimal tyre pressure.
How to improve fuel economy in a diesel car
| Characteristics | Values |
|---|---|
| Driving habits | Avoid aggressive driving and idling, maintain a steady speed, and accelerate slowly |
| Vehicle weight | Remove unnecessary items to reduce weight and improve fuel economy |
| Aerodynamics | Remove roof racks, roof boxes, bull bars, and extended wing mirrors when not in use to reduce drag |
| Tires | Maintain optimal tire pressure, consider narrower tires with the right tread and width |
| Engine maintenance | Regular oil changes, clean or replace air and fuel filters, timely replacement of worn-out parts, especially fuel injectors |
| Fuel type | Use high-quality, premium diesel fuel |
| Additives | Use fuel additives that clean and lubricate the engine |
| Transmission | Use standard or economy mode in automatic vehicles, change gears earlier in manual vehicles |
| Air conditioning | Use sparingly as it consumes electricity produced by the engine |
| Aftermarket parts | Consult a certified diesel mechanic or technician for advice on aftermarket parts |
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What You'll Learn
Reduce drag by removing unnecessary items from your car
Reducing drag is a widely accepted way to improve fuel efficiency in diesel cars. The amount of drag created by a vehicle depends on its shape and the presence of protrusions on its surface. To reduce drag, you can remove unnecessary items from your car, such as those on the roof or in the boot, trunk, or passenger seats.
Roof racks, roof boxes, bull bars, and extended wing mirrors are examples of items that can increase drag. Removing these items when not in use will improve fuel economy. It is important to note that safety items such as a spare wheel should not be removed, as this may be dangerous and inconvenient in the event of a puncture.
The weight of the vehicle is also a factor in fuel efficiency. A heavier vehicle requires more energy to move, which in turn requires more fuel. Therefore, removing unnecessary items from your car can reduce its weight and improve fuel economy.
In addition to removing unnecessary items, optimizing the shape of a vehicle can also reduce drag. Automobile manufacturers have incorporated streamlined designs to improve fuel economy. This includes reshaping the rear end, covering the underside of the vehicle, and reducing protrusions on the surface.
By reducing drag and optimizing the shape of your vehicle, you can improve the fuel efficiency of your diesel car. Remember to consider the weight of the items you are carrying and remove any non-essential items to enhance your fuel economy.
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Avoid aggressive driving and idling
Aggressive driving, such as speeding, rapid acceleration, and braking, can significantly impact fuel economy. Research by the Department of Energy's Oak Ridge National Laboratory found that aggressive driving can lower gas mileage by 10-40% in stop-and-go traffic and 15-30% at highway speeds. This can result in a financial loss of about $0.25 to $1 per gallon. To improve fuel efficiency, it is recommended to drive sensibly and avoid aggressive driving behaviours. Installing a monitor that tracks real-time miles per gallon can help you stay informed about your driving habits and their impact on fuel economy.
Idling, or keeping the engine running while the vehicle is stationary, also affects fuel economy. An idling car can burn between 0.16 to 0.7 gallons of fuel per hour, depending on the engine size and air conditioner usage. Allowing your car to idle for two minutes is equivalent to driving a mile, and idling for over an hour can waste almost a gallon of gas. Idling also causes a build-up of chemicals in the engine, leading to mechanical degradation, increased fuel consumption, and reduced vehicle performance. To improve fuel economy, it is advisable to avoid excessive idling and turn off the engine when the vehicle is not in motion.
For diesel car owners, improving fuel economy is a priority, and addressing aggressive driving and idling habits is crucial. By driving sensibly, installing mileage trackers, and minimising idling, diesel car owners can significantly enhance their fuel efficiency and reduce overall fuel costs. These simple behavioural changes can have a notable impact on both the environment and their wallets.
Additionally, it is worth noting that idling can also impact the environment by releasing harmful toxins into the air, contributing to poor air quality and environmental damage. Therefore, reducing idling times is not only beneficial for fuel efficiency but also for reducing toxic emissions and improving overall air quality.
To summarise, aggressive driving and idling are detrimental to fuel economy in diesel cars. By avoiding these behaviours and implementing simple modifications, diesel car owners can improve their fuel efficiency, reduce costs, and positively impact the environment.
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Maintain optimal tyre pressure
Maintaining optimal tyre pressure is one of the simplest ways to improve the fuel economy of your diesel car. It is also one of the most effective. Tyre pressure has a significant impact on fuel efficiency, and can also affect your vehicle's performance, safety and lifespan.
When your tyres are under-inflated, more of the tyre's surface touches the road. This increases what is known as rolling resistance, which means your engine has to work harder, using more fuel, to move the car at any given speed. Under-inflated tyres can also increase your vehicle's braking distance and decrease its handling responsiveness, making driving less safe.
Conversely, over-inflated tyres can become stiff, leading to a harsher ride and reduced traction, which can also negatively affect fuel economy. They can also cause uneven wear on your tyres.
To maintain optimal tyre pressure, you should check your tyre pressure regularly, ideally once a month or before long trips. You can check the correct pressure for your vehicle on the sticker in the driver's side door jamb or the glove box, in your owner's manual, or by consulting a mechanic. It's best to check the tyre pressure when the tyres are cold, as heat can cause tyre pressure to rise, giving a false reading. Adding a reliable tyre inflator to your tool kit can help you to maintain your tyres at their ideal pressure.
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Use premium air and oil filters
To improve the fuel economy of your diesel car, it is important to use premium air and oil filters. Air filters trap contaminants in a media made of paper and synthetic fibres. Over time, this media becomes filled with dirt and debris, preventing the engine from breathing properly. As a result, the engine will work harder and use more fuel. Therefore, it is important to clean or replace them when changing the motor oil.
A dirty air filter should be swapped out when it looks dirty and allows very little light to pass through. While it is easy to access and replace the air filter, it is important to note that a dirty, paper air filter should not be cleaned but rather replaced.
There are a wide variety of air filters on the market, with some performing better than others. For maximum engine performance and efficiency, it is important to select a high-quality filter. Although they may cost more, good filters provide the best combination of airflow and dirt-trapping ability.
Similarly, regular oil changes with high-quality oil are vital for keeping the engine's parts moving smoothly. Investing in synthetic engine oil can upgrade the overall performance of your diesel engine and improve fuel economy.
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Opt for high-quality fuel and engine oil
Diesel engines are more fuel-efficient than similar-sized gasoline engines, but there are still ways to improve their fuel economy. Opting for high-quality fuel and engine oil is one of the most effective ways to do so.
Firstly, it is important to use high-quality fuel. While premium diesel might cost more upfront, it can improve your vehicle's performance and save you money in the long run. High-quality fuel keeps your engine's parts moving smoothly and prevents unnecessary wear and tear, which can enhance fuel efficiency. Additionally, consider the filling station you choose. High-traffic stations with a constant flow of diesel are preferable as diesel that sits for too long can degrade in quality.
Secondly, regular oil changes with high-quality engine oil are crucial. Synthetic engine oil can improve your diesel engine's performance and fuel economy. It reduces friction between moving parts, allowing the engine to operate more efficiently. This not only improves fuel efficiency but also extends the lifespan of your engine.
Finally, fuel additives are another option to consider. While their impact on fuel efficiency may be minimal, they can clean and lubricate your engine, improving performance and reducing the need for repairs over time.
By choosing high-quality fuel and engine oil, you can improve the performance and fuel economy of your diesel engine, saving money and reducing the environmental impact of your vehicle.
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Frequently asked questions
There are several ways to improve fuel economy in a diesel car. Firstly, you should reduce any excessive weight in your car. The heavier the vehicle, the more fuel it consumes. Remove any unnecessary items from your car, such as unused equipment or tools. Secondly, check your tire pressure. Under-inflated tires can reduce fuel mileage, so ensure your tires are at optimum pressure. Thirdly, avoid aggressive driving and rapid acceleration. Driving at a consistent speed and maintaining a steady pace can help improve fuel efficiency. Finally, regular maintenance and servicing of your diesel engine are crucial. This includes timely oil changes, clean air and fuel filters, and the replacement of worn-out parts.
Aggressive driving and rapid acceleration can significantly impact fuel economy. Driving at a consistent speed and maintaining a steady pace can help improve fuel efficiency. Additionally, driving at high speeds, especially over 55 mph, can burn more diesel. Therefore, it is advisable to drop to a slower speed when on the highway.
Excessive weight can reduce fuel efficiency in a diesel car. The heavier the vehicle, the more fuel it consumes. This is because the engine has to work harder to move the extra weight. By removing unnecessary items from the car, you can reduce the overall weight and improve fuel mileage.
Under-inflated tires increase rolling resistance, making the engine work harder and consume more fuel. On the other hand, over-inflated tires can lead to uneven wear and decreased traction, negatively impacting fuel economy. Maintaining optimal tire pressure is crucial for improving fuel mileage. Additionally, consider using narrower tires as they reduce friction and optimize fuel consumption.
