Rajan Wilcox
The 2008 Super Duty 250 6.4 Diesel has been noted by users to have poor fuel mileage, with figures of 8-9 mpg around town and 13 mpg on the highway. While diesel engines typically offer better fuel economy than gasoline engines, this may not be the case for heavy-duty trucks. Heavy-duty trucks are not required to publish EPA mileage estimates, but tests have shown that diesel trucks can average around 18 mpg, while their gas-fed counterparts average 15 mpg. However, only a few diesel trucks have achieved over 20 mpg in these tests. Factors such as driving conditions, idle times, and regeneration cycles can also impact the fuel economy of diesel trucks. Additionally, diesel engines tend to be more expensive to maintain and operate, which can affect the overall cost of ownership.
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What You'll Learn
The 6.4L Powerstroke engine's poor fuel mileage
The 6.4L Powerstroke engine, released in 2008, was designed to deliver more power, greater torque, and better fuel efficiency than its predecessor, the 6.0L Powerstroke. Despite these intentions, the 6.4L Powerstroke engine has been criticized for its poor fuel mileage.
Several factors contribute to the engine's poor fuel economy. Firstly, the engine's diesel particulate filter (DPF) system, which was introduced to meet stricter emissions standards, can impact fuel efficiency. The DPF captures soot from the exhaust stream, and as it accumulates particulate matter, it requires regular cleaning. This maintenance aspect can be inconvenient and impact fuel economy if not properly managed.
Secondly, the 6.4L Powerstroke engine's fuel injection system may also play a role in its poor fuel mileage. Unlike older models that utilized replaceable or cleanable filters, the 6.4L engine injects extra diesel during the exhaust stroke to burn off soot. This process can decrease fuel efficiency and impact overall engine performance.
Additionally, the 6.4L Powerstroke engine has been associated with other issues, such as leaking radiators, cracked pistons, and problems with injectors, turbochargers, and EGR valves. These issues can lead to costly repairs, further impacting the engine's overall value and ownership experience.
Despite the challenges with fuel economy, the 6.4L Powerstroke engine offers impressive performance and towing potential. It provides substantial power and torque, making it capable of handling heavy-duty tasks and off-road conditions. However, for those considering this engine, proper pre-purchase inspections, regular maintenance, and extended warranties are recommended to mitigate potential issues and expenses.
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Regeneration cycles killing fuel economy
Regeneration cycles can have a negative impact on the fuel economy of Super Duty Diesels. Diesel Particulate Filters (DPFs) are essential components of modern diesel engines, designed to capture and remove particulate matter, such as soot and other fine particles, from the engine's exhaust gases. While DPFs help to reduce emissions and meet environmental standards, the regeneration process can lead to increased fuel consumption.
The regeneration process involves burning off the accumulated soot from the DPF to prevent it from clogging and reducing the engine's performance. This is typically done through passive regeneration, active regeneration, or passive-active regeneration. During active regeneration, fuel is injected into the exhaust stream, which generates a high amount of heat to burn off the soot. This additional fuel injection can lead to increased fuel consumption and impact fuel economy.
In certain driving conditions, such as frequent stops in city driving, passive regeneration may not occur as the exhaust gases cannot reach the required temperature. This results in more frequent active regeneration cycles, further impacting fuel economy. Additionally, a clogged DPF can decrease engine performance and increase fuel consumption, leading to a loss of power and potentially higher emissions of harmful pollutants.
The proper use of oil additives can help reduce the number of regen cycles and improve fuel economy. These additives clean the engine parts, reducing the buildup of particulates in the DPF. They also improve combustion efficiency, resulting in better fuel economy and engine performance.
Overall, while the regeneration process is necessary for the proper functioning and maintenance of diesel engines, it can contribute to the decreased fuel economy sometimes experienced by Super Duty Diesel owners. Proper maintenance, including the use of recommended oil additives, can help mitigate the impact of regeneration cycles on fuel economy.
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Idle times and revs impacting mileage
Idle times and revs can significantly impact the mileage of a vehicle. Idling refers to running a vehicle's engine when it is not in motion, such as when stuck in traffic or at a red light. While idling may seem harmless, it can have several negative consequences. Firstly, it wastes fuel and increases fuel consumption. Leaving a car engine running for just two minutes is equivalent to driving a mile, which can quickly add up and impact fuel economy. Idling also releases harmful carbon dioxide into the atmosphere, contributing to air pollution and climate change. The Environmental Protection Agency (EPA) recommends limiting idling to just 30 seconds, and several states and cities have anti-idling laws in place to reduce emissions and improve air quality.
Additionally, idling can negatively affect a car's engine and battery. It causes twice as much wear and tear on internal engine parts compared to driving at regular speeds, and the partial combustion of fuel during idling can lead to a buildup of carbon residue on cylinder walls. Furthermore, idling does not allow the battery to fully charge, which can create additional stress and shorten its lifespan.
In terms of revs, or revolutions per minute (RPM), there is some debate about their impact on mileage. Some sources suggest that fewer revs can lead to worse mileage, while others argue that it is the other way around. Larger tires, for instance, have a higher coefficient of drag and can contribute to reduced mileage despite having fewer revolutions per mile. However, it is important to note that the impact of revs on mileage may be less significant than other factors, such as weight and tire softness.
To improve the mileage of a Super Duty Diesel, it is recommended to keep the RPM below 2000 and minimize idle times. Reducing idle times can help improve fuel economy and reduce emissions, contributing to a more environmentally friendly driving experience. Additionally, keeping RPMs under control can also help optimize fuel usage and engine performance.
In summary, idle times and revs can significantly impact the mileage of a vehicle. Reducing idle times and maintaining optimal RPM levels are crucial for improving fuel economy, reducing emissions, and enhancing engine performance. By following these guidelines, drivers can make a positive impact on the environment and their vehicles' overall efficiency.
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The cost of diesel vs. gasoline
The cost of diesel versus gasoline is a complex topic, with several factors influencing the relative prices of these fuels. Firstly, it's important to note that both diesel and gasoline are derived from crude oil and primarily consist of hydrocarbons. However, gasoline is lighter and typically contains hydrocarbons with up to 12 carbon atoms, while diesel has a higher hydrocarbon range, usually containing 12 to 16 carbon atoms. This difference in chemical composition gives diesel a higher energy content per gallon, which contributes to its higher price.
Historically, gasoline traded at a premium to diesel, but this trend reversed in the mid-2000s. In 2006, the United States began transitioning to ultra-low-sulfur diesel (ULSD) to reduce the emission of harmful compounds produced by the combustion of high-sulfur fuels. This change had a significant impact on diesel prices. Refineries were required to invest significant capital in new equipment to remove sulfur from diesel fuel, increasing production costs. Additionally, the shift in demand from high-sulfur ("sour") crude oils to lower-sulfur ("sweet") crudes further widened the price differential between diesel and gasoline.
The relative prices of diesel and gasoline also depend on geographical location. In Canada, for example, diesel is consistently cheaper than gasoline, sometimes by as much as 15-20%. This price difference, combined with the inherently better fuel efficiency of diesel engines, can result in substantial fuel cost savings for diesel vehicles. However, diesel engines often carry higher maintenance costs, which may offset the fuel savings over time.
In terms of fuel economy, diesel engines generally outperform their gasoline counterparts. In a test of heavy-duty pickups, diesel trucks averaged 18 miles per gallon (mpg), while gas-fed models averaged 15 mpg. Only two diesel trucks, the 2018 Ram 2500 and the 2023 Ford F-250 Super Duty, achieved over 20 mpg. These results highlight the superior fuel efficiency of diesel engines, but it's important to note that real-world fuel economy can vary based on driving conditions and vehicle specifications.
Overall, the decision between diesel and gasoline involves weighing various factors, including fuel costs, maintenance expenses, fuel efficiency, and personal preferences. While diesel engines typically offer better fuel economy, their higher maintenance costs and fluctuating fuel prices may impact the overall ownership experience. Therefore, it's essential to consider both short-term and long-term expenses when deciding between diesel and gasoline vehicles.
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The driving conditions and usage of the truck
Another factor to consider is the load or cargo carried by the truck. A fully loaded or heavily loaded truck will consume more fuel compared to a lightly loaded or empty truck. The weight and size of the cargo can influence fuel mileage, with heavier or bulkier loads requiring more fuel to propel the vehicle. Furthermore, driving conditions such as hilly or mountainous terrain, rough roads, or off-road environments can also affect fuel mileage. The demand on the engine to navigate steep inclines, uneven surfaces, or challenging off-road conditions can result in increased fuel consumption.
Weather conditions and climate can also impact the fuel mileage of the truck. Cold temperatures can affect the performance of the engine and lead to reduced fuel efficiency. Additionally, driving in extreme weather conditions, such as snow or heavy rain, may require the use of four-wheel drive or lower gear ratios, which can increase fuel consumption. Similarly, high winds, especially when driving at highway speeds, can impact the aerodynamics of the truck and affect fuel mileage.
The usage of the truck in terms of distance and frequency of trips also plays a role in fuel mileage. Longer commutes or frequent long-distance trips can result in higher overall fuel consumption. The cumulative effect of longer distances travelled can impact fuel efficiency, especially if the truck is not designed for extended range. Conversely, short-distance trips or infrequent usage may lead to lower fuel mileage due to the engine not reaching optimal operating temperatures or the higher proportion of idle and stop-start driving.
The type of driving conditions and usage of the truck can significantly influence its fuel mileage. Understanding these factors can help optimize fuel efficiency and make informed decisions regarding the choice of vehicle, engine specifications, and driving habits to improve overall fuel economy.
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Frequently asked questions
Super-duty diesel trucks are not required to publish EPA mileage estimates, but tests show that they burn a lot less fuel than gas-fed models. Diesel engines in light-duty trucks are no longer available, and diesel engines are more expensive to maintain.
Driving conditions, regeneration cycles, idle times, and revolutions per minute (RPM) can all impact the fuel economy of super-duty diesels.
The 2023 Ram 1500 with the 3.0 EcoDiesel has an average of 22.1 mpg, while the GMC Sierra with a 3.0L LZ0 averages 23.7 mpg.
Diesel engines typically have better fuel economy than gasoline engines in automobiles, but this advantage is not as significant in trucks. A 2012 study found that the average cost of ownership for diesel vehicles was higher than for gasoline-powered vehicles over five years.
