Rajan Wilcox
Diesel trucks are known for their fuel efficiency, but there are several ways to further improve fuel economy. Some methods include adjusting driving habits, reducing drag, maintaining optimal tire pressure, and keeping the engine well-serviced. Driving style plays a significant role in fuel efficiency, with smooth and steady acceleration being more economical than rapid acceleration and sudden stops. Additionally, utilizing cruise control on highways and maintaining a constant speed can improve mileage. Reducing drag with aerodynamic accessories and ensuring proper tire pressure are also effective ways to enhance fuel economy. Regular engine maintenance, such as oil changes with high-quality or synthetic oil, clean air and fuel filters, and timely replacement of worn-out parts, can also contribute to better fuel efficiency.
| Characteristics | Values |
|---|---|
| Engine maintenance | Regular oil changes, clean air and fuel filters, timely replacement of worn-out parts, tune-ups, and use of high-quality diesel |
| Tire pressure | Maintain optimal pressure as recommended by the manufacturer; check at least once a month and after significant weather changes |
| Weight | Remove unnecessary weight from the vehicle |
| Driving style | Avoid rapid acceleration and sudden stops, use cruise control, reduce idling time, and maintain a steady speed |
| Accessories | Install aerodynamic accessories like tonneau covers to reduce drag |
| Aftermarket parts | Install performance parts like air filters, exhaust systems, and performance chips to improve engine functions and fuel economy |
| Fuel additives | Use of additives is controversial, with some sources claiming minimal impact and others recommending them for engine maintenance |
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What You'll Learn
Reduce drag with aerodynamic accessories
Reducing drag has become one of the most widely accepted ways to improve fuel efficiency in trucking fleets. There are a variety of aftermarket accessories that can be installed on diesel trucks to reduce drag and improve fuel economy.
One way to reduce drag is to install vortex generators, fairings, side skirts, vented mud flaps, drive fenders, and wheel covers. These devices can help to smooth out airflow around the vehicle, reducing turbulence and drag. This can lead to significant fuel savings over time.
Another way to reduce drag is to use a truck with a more streamlined design, such as a low-cab-forward (LCV) truck. LCV trucks have a smaller profile and fewer protrusions, which can reduce the amount of drag they create while driving. This can lead to a significant reduction in fuel consumption, with some estimates suggesting a 39% decrease in fuel usage compared to conventional tractor-trailers.
In addition to vehicle design, the way vehicles are driven can also impact drag. For example, when multiple vehicles are driven together, such as in a platoon or road train, the aerodynamically 'clean' vehicle should be in the lead position, with the aerodynamically 'dirty' vehicle in the last position. This can help to reduce the overall drag on the group of vehicles, improving fuel efficiency.
Finally, some accessories can be added to the tractor-trailer combination to reduce drag. For example, TruckWings technology helps close the gap between the tractor and trailer, reducing the low-pressure area that forms and causing air speed to drop, which in turn reduces downstream turbulence and drag. This can be especially effective in high crosswind environments.
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Maintain optimal tyre pressure
Maintaining optimal tyre pressure is crucial for improving the fuel economy of your diesel truck. Under-inflated or over-inflated tyres can decrease your fuel efficiency. Therefore, it is essential to regularly check your tyre pressure and ensure it aligns with the manufacturer's recommended psi.
To get an accurate tyre pressure reading, it is best to check when the tyres are cold, allowing sufficient time for them to cool down from normal operation, typically around 3-4 hours. Additionally, ensure that each tyre has metal valve caps to prevent debris from entering the stem and causing leaks.
You can usually find the recommended tyre pressure for your vehicle on a sticker in the driver's side door jamb, the glove box, or in the owner's manual. It is important to note that the maximum pressure printed on the tyre's sidewall may not be the optimal pressure for your vehicle.
By maintaining the optimal tyre pressure, you can improve your vehicle's gas mileage and extend the lifespan of your tyres. It is recommended to check your tyre pressure at least once a month and adjust it according to the manufacturer's guidelines.
Additionally, be mindful that changes in air temperature can affect tyre pressure. Air pressure in tyres tends to increase when it's hot and decrease when it's cold, so regular checks and adjustments are necessary to maintain optimal pressure.
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Use cruise control
Using cruise control can help improve fuel efficiency in diesel trucks. Cruise control is an electric system that helps you drive at a constant speed, eliminating the need for you to press the acceleration pedal. This can be particularly useful on highways or when driving on flat terrain, as it prevents unnecessary acceleration and deceleration, which can consume more fuel.
The use of cruise control can also improve driver comfort and focus by reducing the need to manually maintain speed. This can be especially beneficial during long-distance driving, as it helps lessen driver fatigue. Additionally, some modern vehicles are equipped with adaptive cruise control, which allows you to set and maintain a desired speed while also maintaining a safe distance from other vehicles on the road.
While cruise control can be beneficial in certain situations, it may not be suitable for all driving conditions. For example, if you live in an area with hilly terrain or frequent traffic congestion, cruise control may not provide the expected fuel efficiency gains. This is because cruise control maintains a constant speed regardless of the terrain, which can lead to increased fuel consumption when ascending or descending hills.
It's important to note that the effectiveness of cruise control in improving fuel economy may vary depending on the vehicle and road conditions. Some studies suggest that cruise control can lead to a slight increase in fuel consumption across a fleet of vehicles. However, a modified cruise control system that allows speed variation within defined limits in response to changing road grades has shown to achieve higher fuel economy than standard cruise control.
Overall, while cruise control can be a useful tool for improving fuel efficiency in diesel trucks, it should be used in conjunction with other fuel-saving practices and may not be suitable for all driving conditions or vehicles. It is always recommended to follow the vehicle manufacturer's guidelines and consult a professional mechanic for specific advice.
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Reduce rapid acceleration
One of the most important aspects of improving fuel economy in a diesel truck is preventative maintenance. Regular oil changes with high-quality oil are vital for keeping the engine's parts moving smoothly. Switching from standard to synthetic oil can improve fuel economy by up to 11%. Synthetic oils provide superior lubrication, reduce friction, and withstand higher temperatures, resulting in smoother engine operations and reduced wear and tear on engine parts.
Another way to improve fuel economy is by reducing rapid acceleration. While some situations require quick acceleration, such as merging onto a highway, accelerating too fast can hurt your diesel engine’s fuel mileage. It is better to utilize smooth, steady acceleration to prevent excessive fuel burning. The lower the RPMs used in your diesel engine, the better your fuel efficiency.
Cruise control is a useful tool to maintain a constant speed without having to accelerate rapidly. When driving on flat terrain, using cruise control can help improve fuel efficiency. Additionally, trucks burn less fuel at lower speeds. Reducing your speed by 5 to 10 mph can improve fuel economy by 7 to 14%.
Aftermarket performance parts can also help improve fuel economy. For example, performance air filters allow more air to flow into the engine, improving combustion efficiency and leading to better gas mileage. Similarly, performance exhaust systems can reduce exhaust back pressure and increase engine efficiency. Upgrading to a high-quality chip or programmer can deliver substantial gains in fuel economy by optimizing the fuel-air mixture and other variables.
Finally, reducing the weight of your truck can significantly improve fuel economy. Diesel engines are designed to haul heavy cargo, but unnecessary weight can decrease fuel efficiency. Removing any non-essential items can reduce the overall weight of the vehicle, improving fuel economy and putting less strain on the engine, brakes, and suspension.
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Use high-quality fluids and oils
Using high-quality fluids and oils is essential for improving the fuel economy of a diesel truck. Regular oil changes with high-quality oil are crucial for keeping the engine's parts moving smoothly, reducing friction, and preventing the buildup of sludge and debris that can harm engine components. Synthetic engine oils are a good choice as they offer superior lubrication, reduce friction, and withstand higher temperatures compared to mineral oils. This results in smoother engine operations and reduced wear and tear on engine parts.
In addition to using high-quality oil, it is also important to keep the fuel system clean. Over time, fuel injectors can become clogged, reducing their effectiveness. Using diesel fuel additives can help clean the system and improve performance. However, it is worth noting that the effectiveness of fuel additives in improving fuel efficiency is debated, and most newer truck engines do not require any additives.
Clean air filters also play a significant role in maintaining fuel efficiency. A dirty or clogged air filter restricts airflow to the engine, causing it to work harder and burn more fuel. Replacing air filters at recommended intervals ensures optimal airflow, improved engine performance, and better fuel economy.
Upgrading to high-quality fluids and oils may come at a higher cost, but the improved fuel efficiency and extended lifespan of your diesel engine can make it a worthwhile investment.
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Frequently asked questions
Reducing aggressive driving habits can improve fuel mileage without any cost. Avoid rapid acceleration, sudden stops, and idling. Instead, maintain a steady speed and use cruise control when possible.
Regular maintenance and tune-ups are crucial for improving fuel economy. This includes timely oil changes with high-quality or synthetic oil, cleaning or replacing air and fuel filters, and replacing worn-out parts, especially fuel injectors.
Underinflated or overinflated tires increase rolling resistance, reducing fuel efficiency. Check your tire pressure regularly and adjust it according to the manufacturer's recommendations. Also, inspect your tires for any cracks, bulges, or abnormal wear.
Reducing the weight of your truck, installing aftermarket performance parts, and using aerodynamic accessories can improve fuel economy. Additionally, fuel additives and performance chips can be used, but their effectiveness may vary.
