Regan Brown
Owners of Duramax diesel vehicles have reported a wide range of fuel mileage figures, with some claiming exceptionally high numbers. Factors that can affect fuel mileage include tire size, gearing, vehicle weight, aerodynamics, torque, RPM, speed, terrain, and engine health. Modifying the vehicle with a lift pump, straight exhaust, or custom tuning can improve fuel efficiency, but adding heavy bumpers, large tires, or excessive lifts will hurt fuel mileage. Driving style also plays a significant role, with slower speeds, conservative acceleration, and avoiding cruise control reported to improve fuel mileage.
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Reduce speed
Driving at lower speeds is one of the most effective ways to increase fuel mileage in a Duramax Diesel. While driving at higher speeds may seem more efficient, it can actually lead to decreased fuel economy. This is because the engine has to work harder to maintain those speeds, especially when towing a trailer or hauling a heavy load.
For example, one user reported that driving their Duramax at speeds above 70 mph resulted in poor fuel mileage of 9-10 mpg. However, by reducing their speed to below 60 mph on flat roads and below 50 mph on climbs, they were able to achieve an average of 12.5 to 13 mpg. Another user reported an average of 24-25 mpg when driving their GMC Duramax at speeds between 67-70 mph, which is significantly higher than the 9-10 mpg achieved at higher speeds.
Additionally, driving at lower speeds can also help to reduce wind resistance, which further improves fuel economy. This is especially true when driving on highways, where wind resistance can significantly impact fuel mileage. By reducing wind resistance, you can help your Duramax Diesel engine operate more efficiently, resulting in improved fuel mileage.
It is also worth noting that driving at lower speeds can also help to improve safety, as it gives you more time to react to potential hazards on the road. This can help reduce the risk of accidents and keep you and your vehicle safe.
In conclusion, reducing speed is a simple yet effective way to increase fuel mileage in a Duramax Diesel. By driving at lower speeds, you can help your engine operate more efficiently, reduce wind resistance, and improve safety on the road. While it may take a little longer to reach your destination, the fuel savings and added safety make it a worthwhile trade-off.
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Lower the vehicle
Lowering your vehicle can lead to better fuel mileage, but the gains may not be significant. Some car manufacturers have lowered their vehicles to increase fuel efficiency, and testing has shown an increase in MPG of up to 13%. However, this is not always the case, and in some instances, lowering a vehicle may lead to worse fuel economy. The change in MPG will depend on various factors, such as the vehicle model, driving speed, road conditions, and the presence of speed bumps.
Lowering your vehicle can also improve its handling and aerodynamics, which can contribute to better fuel efficiency. A lower vehicle has a lower centre of gravity, which can improve stability and cornering ability. Additionally, a lower vehicle may experience less wind resistance, resulting in better fuel mileage, especially at higher speeds.
However, it is important to note that lowering a vehicle can also have some drawbacks. A lower vehicle may have reduced ground clearance, which can lead to issues when encountering speed bumps or uneven road surfaces. Additionally, lowering a vehicle can affect its comfort and ride quality, especially if done aggressively or with inferior components.
When considering lowering your vehicle to improve fuel mileage, it is essential to weigh the potential benefits against the costs and potential negative impacts on performance and comfort. It may be more effective to explore other options, such as reducing weight, optimising tyre size and pressure, improving aerodynamics through body modifications, or using fuel-efficient driving techniques.
If you decide to lower your vehicle, it is recommended to consult a professional and use high-quality components to ensure the job is done correctly and safely.
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Improve aerodynamics
Improving the aerodynamics of your Duramax Diesel vehicle can help increase fuel mileage. While there aren't many ways to directly improve the aerodynamics of your truck, there are some modifications and driving practices that can help in this area.
Firstly, consider the size and shape of any trailers or cargo you are hauling. A heavy or bulky trailer can significantly reduce fuel efficiency, especially when driven at higher speeds. A more streamlined trailer, such as a fifth wheel, can help improve aerodynamics and increase fuel mileage. Additionally, lowering the height of your truck bed by a few inches can also help improve aerodynamics and make it easier to reach items in the bed.
Another factor to consider is the size of your tires. Larger tires, lifts, and heavy bumpers can negatively impact fuel mileage. Opting for smaller tires, around 35" on a reasonable rim, can improve aerodynamics and fuel efficiency. Additionally, removing any unnecessary modifications or accessories that create drag can help streamline your vehicle and improve its aerodynamics.
Finally, driving practices can also impact the aerodynamics of your vehicle. Driving at lower speeds, especially around 60 mph, can improve fuel mileage. Additionally, driving with a tailwind, when possible, can further enhance your vehicle's aerodynamics and fuel efficiency. Slowing down when navigating windy roads or areas with strong headwinds can also help maintain optimal aerodynamics.
By combining these modifications and driving practices, you can improve the aerodynamics of your Duramax Diesel vehicle and increase your overall fuel mileage.
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Reduce weight
The weight of your vehicle has a significant impact on fuel mileage. The heavier the vehicle, the more fuel it will consume to move. This is because the engine has to work harder to overcome the force of gravity acting on the vehicle's mass.
One way to improve fuel mileage is to reduce the weight of the vehicle. This can be achieved by removing unnecessary items from the vehicle, such as tools, equipment, or any other heavy items that are not required for the journey. It is also worth considering the weight of any added features or modifications to the vehicle, such as larger tires or a lift kit, which can increase weight and negatively impact fuel economy.
For example, one user reported a slight improvement in fuel mileage after their vehicle lost some weight. Another user noted that their GM truck, which is slightly lighter than comparable vehicles, tends to achieve better fuel mileage. Additionally, a lighter trailer can also improve fuel mileage, as towing a heavy trailer can significantly reduce fuel efficiency.
It is important to note that the weight of the vehicle is just one factor influencing fuel mileage. Other factors include driving speed, terrain, wind conditions, engine health, tire size, and more. However, by reducing the weight of your vehicle, you can contribute to improving your overall fuel mileage, especially when combined with other fuel-saving strategies.
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Upgrade the turbo
Upgrading the turbo is a great way to improve the fuel mileage of your Duramax Diesel engine. The Duramax engine's superior fuel efficiency can be attributed to its turbo, which is larger than those found in 6.0 engines. By increasing the airflow, the turbo enhances the engine's performance.
One popular upgrade option is the Stage 1 turbo, also known as the "Durastroke". This upgrade has proven to increase mileage significantly. When considering an upgrade, it is important to remember that bigger turbos will result in better airflow and, consequently, improved mileage.
Another upgrade option is to install a turbo-back exhaust system. This modification can improve fuel efficiency and enhance the engine's sound. A turbo-back exhaust upgrade typically involves replacing the stock exhaust components with larger-diameter pipes, which can improve airflow and reduce back pressure.
Additionally, you can consider deleting the catalytic converter (cat), which is located in the exhaust system. Removing the cat can free up airflow and improve engine performance, resulting in increased fuel mileage.
Upgrading the turbo is a great starting point for improving fuel mileage, and it can be complemented by other modifications such as an exhaust system upgrade or catalytic converter deletion for even better results.
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Frequently asked questions
Driving at slower speeds and reducing your RPMs can help you get better fuel mileage.
Try to avoid using cruise control, especially when driving up steep terrain.
Yes, you can add a lift pump, a 5" down pipe back straight exhaust, or a tuner to your Duramax Diesel.
The heavier your vehicle, the worse your fuel economy will be.
Yes, factors such as wind speed and direction, terrain, and tire size can also impact fuel mileage.
