Sylvie Willis
Diesel engines are more fuel-efficient than their gasoline counterparts, but there are still ways to improve their fuel economy. Driving habits, such as maintaining a steady speed and avoiding aggressive acceleration, can significantly impact fuel consumption. Regular vehicle maintenance, including oil and filter changes, is also crucial. Additionally, reducing drag and ensuring optimal tyre pressure can further enhance fuel efficiency. Upgrades like high-flow air filters, exhaust modifications, and fuel additives can also improve diesel engine performance and economy.
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What You'll Learn
- Maintain your vehicle with regular oil changes and filter replacements
- Avoid over-revving the engine and accelerate smoothly
- Keep tyres at the manufacturer's recommended psi to reduce the impact of temperature changes
- Reduce drag with vortex generators, fairings, side skirts and wheel covers
- Use a fuel additive to increase lubricity and improve fuel quality
Maintain your vehicle with regular oil changes and filter replacements
Diesel engines tend to be long-lasting, but they do require proper maintenance. Regular oil changes and the use of fuel filters are essential for maintaining the health of your engine and improving fuel efficiency.
Oil changes are an important preventative measure to ensure the engine runs smoothly and to prevent breakdowns. Motor oil breaks down over time, becoming thick and sludgy, which can cause engine blockages and increase wear and tear on parts. This reduces the engine's efficiency, causing it to use more fuel.
By changing your oil regularly, you can improve fuel mileage, reduce emissions, and extend the life of your vehicle. Fresh oil moves more efficiently through the engine, clearing out sludge and better lubricating metal parts, reducing friction and heat. This allows the engine to run more efficiently, improving fuel economy.
In addition to regular oil changes, it is important to use high-quality oil with the proper viscosity for the exterior temperature. High-quality fluids can improve overall fuel mileage. The use of synthetic oil, for example, can improve fuel economy by up to 11%.
Finally, it is worth noting that fuel filters are also important for improving fuel economy. A clean fuel filter ensures that fuel can reach its intended destination without obstruction, optimizing fuel usage.
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Avoid over-revving the engine and accelerate smoothly
One of the key ways to improve the fuel economy of a diesel engine is to avoid over-revving the engine and accelerate smoothly. This means that rather than accelerating quickly and reaching high revolutions per minute (RPM), it is more efficient to accelerate gently and keep the RPM low.
When a diesel engine accelerates quickly, it requires a substantial amount of horsepower, which can cause a significant drop in mileage. By avoiding this, you can prevent excessive fuel burning and improve your overall fuel efficiency.
Maintaining a steady speed is also important. Driving too slowly or too fast can cause too much fuel to be injected into the engine, as the engine compensates for the lack or excess of speed. Finding the optimal speed for your vehicle can improve fuel economy by a third or more. For diesel engines, this is typically around 30-48 mph, although for some vehicles, it may be higher, around 60 mph.
In addition to smooth acceleration, it is also beneficial to anticipate traffic flow and maintain a safe distance from other vehicles. This way, you can avoid sudden stops and starts, which can waste fuel.
Overall, by avoiding over-revving and adopting a smooth and steady driving style, you can significantly improve the fuel economy of your diesel engine.
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Keep tyres at the manufacturer's recommended psi to reduce the impact of temperature changes
Keeping your tyres in good condition is essential for improving the fuel economy of your diesel vehicle. One critical aspect of tyre maintenance is ensuring that they are inflated to the manufacturer's recommended psi. This is because changes in air temperature can impact tyre pressure. When it's hot, the air inside the tyre expands, increasing the pressure, and when it's cold, the air contracts, leading to a decrease in pressure.
Maintaining the recommended psi is crucial as both under-inflated and over-inflated tyres can negatively affect your fuel mileage. Under-inflated tyres create more rolling resistance, making it harder for your engine to turn them, which consumes more fuel. On the other hand, over-inflated tyres can lead to increased road impact and faster wear and tear on your tyres, reducing their lifespan.
To ensure your tyres are at the optimal pressure, it's a good idea to check them regularly with a pressure gauge. This is especially important before embarking on a long journey or when there have been significant fluctuations in temperature. By keeping your tyres at the manufacturer's recommended psi, you can help reduce the impact of temperature changes and improve your vehicle's fuel economy.
Additionally, choosing the right type of tyres can also make a difference. Narrower tyres, for example, can improve fuel efficiency by reducing the amount of friction between the tyre and the road. When selecting new tyres, it's worth considering those with a tread and width that are optimised for better fuel economy.
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Reduce drag with vortex generators, fairings, side skirts and wheel covers
Reducing drag is one of the most widely accepted ways to improve fuel efficiency in trucks. One way to achieve this is by using vortex generators, fairings, side skirts, vented mud flaps, drive fenders, and wheel covers.
Vortex generators are small aerodynamic devices that can be positioned on the sides of a trailer or tractor. They create small spinning air motions, called vortices, which energize the air layer near the vehicle, reducing turbulence and drag. Side skirt vortex generators are particularly effective, as they help air move smoothly around the vehicle, improving speed and reducing fuel consumption and emissions. Tests in wind tunnels have found that placing vortex generators at a 9-degree angle reduces drag by 20%, while a 50-degree angle improves airflow and reduces air disturbance.
Fairings are another way to reduce drag. Aerodynamic skirts and fairings are designed to promote fuel efficiency in semi-trucks, leading to significant fuel savings. These are available as a package, including wheel covers, side and top trailer fairings, and skirt panels, or they can be purchased separately.
Side skirts are another device that can be used to reduce drag. They work by cutting down the area where air tends to break away from the sides of the vehicle, keeping the airflow smooth and reducing turbulence. Tests have shown that side skirts can cut drag by up to 26%.
Wheel covers are also available as part of a fuel-saving aerodynamic kit, which can be purchased to improve fuel efficiency.
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Use a fuel additive to increase lubricity and improve fuel quality
The lubricity of diesel fuel is essential for the optimal performance and longevity of modern diesel engines. Fuel lubricity refers to the fuel's ability to prevent wear and tear on engine components such as fuel injectors and pumps, which are integral to the operation of a diesel engine.
The transition to ultra-low-sulphur diesel (ULSD) has reduced the ability of diesel fuel to lubricate fuel injection equipment, leading to increased wear on key components. To address this issue, fuel additives that improve lubricity have been developed. These additives, often derived from biodiesel or biofuels, form protective films on metal surfaces, reducing friction and wear.
When choosing a fuel additive, it is important to select one that suits your particular needs and to exercise caution when considering aftermarket additives. High-quality commercial fuels from reputable marketers already contain all the necessary additives and have been extensively tested to minimise the possibility of adverse interactions. If additional additives are desired, they should be chosen based on careful research and used according to the recommendations of the supplier and engine manufacturer.
One example of a fuel additive that can improve lubricity and fuel quality is Hot Shot Secret's Everyday Diesel Treatment (EDT). EDT is designed to address the issues with diesel fuel in the USA, which has low lubricity and a low Cetane rating, resulting in low-energy fuel that doesn't lubricate the engine effectively. By using a fuel additive, you can improve the lubricity of your diesel fuel, enhance engine performance, and potentially extend the life of your engine.
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Frequently asked questions
There are several ways to improve fuel economy in a diesel vehicle, including:
- Maintaining optimal tyre pressure.
- Driving at a steady speed and avoiding accelerating quickly.
- Reducing drag.
- Regular maintenance, including oil and filter changes.
Switching from standard to synthetic oil can improve fuel economy. Synthetic lubricants can increase fuel economy by between 2% and 5%.
Under-inflated or over-inflated tyres can decrease fuel mileage. It is important to maintain the recommended tyre pressure to ensure optimal fuel economy. Changes in air temperature can impact tyre pressure, so it is important to regularly check and adjust tyre pressure as needed.
Aggressive driving behaviours such as accelerating quickly, driving at high speeds, and idling can decrease fuel economy. Slowing down and maintaining a steady speed can improve fuel economy by up to a third.
