Regan Brown
Heavy-duty vehicles are generally less fuel-efficient than light-duty vehicles, and diesel engines are more fuel-efficient than gasoline engines. The first joint GHG emissions and fuel consumption standards for medium- and heavy-duty vehicles were adopted in the United States in 2011, with Phase 2 standards projected to reduce diesel consumption by 0.5 million barrels of oil equivalent per day by 2040. The weight of heavy-duty trucks and vehicles reduces their miles per gallon (mpg), and they are not required to report their fuel economy. However, independent testing has shown that heavy-duty diesel trucks can achieve between 14 and 24 mpg, depending on the model and usage. By 2040, the average fuel economy of new medium- and heavy-duty vehicles is expected to reach 10.6 miles per gallon gasoline equivalent, representing a 33% improvement.
| Characteristics | Values |
|---|---|
| Fuel economy standards for heavy-duty vehicles | Implemented in 2011 |
| Fuel economy | 14-15 mpg |
| Fuel economy standards impact | Diesel consumption |
| Fuel economy standards goal | Reduce diesel consumption |
| Fuel economy standards for light-duty vehicles | Implemented in the 1970s |
| Phase 2 fuel economy standards | To be implemented in 2021 |
| Projected diesel consumption reduction by 2040 | 0.5 million barrels of oil equivalent per day |
| Average fuel economy of new medium and heavy-duty vehicles by 2040 | 10.6 miles per gallon |
| Average fuel economy improvement by 2040 | 33% |
| Fuel economy variance | Based on usage, weight hauled, and towing |
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What You'll Learn
Heavy-duty diesel trucks are not required to report fuel economy
Heavy-duty diesel trucks are not required to report their fuel economy. However, publications like Consumer Reports and Car and Driver independently gather data via real-world testing. Despite this, hundreds of thousands of heavy-duty trucks are sold each year. Many buyers are attracted by their powerful diesel engines, which can be more fuel-efficient than gas engines.
While the Environmental Protection Agency (EPA) collects data on heavy-duty pickup truck emissions and fuel economy, it has never made this information available to the public, largely due to budgetary constraints. The National Highway Traffic Safety Administration (NHTSA) also plays a role in developing fuel efficiency standards, but there is a lack of transparency around the data.
The absence of mandatory fuel economy reporting for heavy-duty diesel trucks creates a knowledge gap for consumers. Organizations like Consumers Union advocate for greater transparency, urging the EPA and NHTSA to make fuel economy, emissions, and expected average fuel cost data accessible to the public. This information could empower consumers to make more informed decisions when purchasing heavy-duty vehicles.
Proposed fuel economy standards for medium- and heavy-duty vehicles aim to reduce diesel consumption. These standards, developed by the U.S. Energy Information Administration (EIA), are expected to decrease diesel consumption by 0.5 million barrels of oil equivalent per day by 2040. By the same year, the average fuel economy of new medium and heavy-duty vehicles is projected to reach 10.6 miles per gallon gasoline equivalent, representing a 33% improvement.
While heavy-duty diesel trucks may not be required to report their fuel economy, there are efforts to improve fuel efficiency and reduce diesel consumption in this vehicle segment.
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Diesel engines in light-duty trucks are disappearing
The future of diesel engines in light-duty trucks is uncertain, with some sources suggesting they are disappearing or being phased out, while others argue that diesel propulsion will persist for at least another decade or even longer. Several factors contribute to the perception that diesel engines in light-duty trucks are on the decline:
Firstly, there has been a growing focus on improving fuel economy and reducing diesel consumption in both medium- and heavy-duty vehicles. The proposed Phase 2 standards, issued by the U.S. Environmental Protection Agency and the National Highway Traffic Safety Administration, aim to increase fuel economy and reduce diesel consumption. These standards will affect diesel fuel consumption primarily, with an expected 18% lower diesel consumption by 2040 compared to the reference case.
Secondly, some automakers have started to phase out diesel engines from their lineups. For example, Jeep discontinued its 3.0-liter EcoDiesel V-6 option for the 2024 Gladiator, joining other discontinued diesel engines from Chevy, GMC, Ford, and Ram. This trend suggests a shift away from diesel engines in light-duty trucks.
However, it is important to note that diesel engines still have a significant presence in the automotive industry, particularly in the heavy-duty pickup truck segment. The Big Three (General Motors, Ford, and Ram) continue to invest in diesel internal combustion engines (ICE), indicating their commitment to diesel-powered HD trucks for the foreseeable future. For instance, General Motors invested nearly $1 billion in its DMAX engine operation, suggesting that diesel-powered options will be available for some time.
Additionally, diesel engines have made significant improvements in terms of emissions and power. The current crop of diesel engines from Power Stroke, Cummins, and Duramax are the cleanest and most powerful ever offered, meeting stricter emissions standards. As emissions standards continue to evolve, diesel engine manufacturers have consistently risen to the challenge, resulting in cleaner and more efficient engines.
In conclusion, while there are indications that diesel engines in light-duty trucks may be disappearing, their complete phase-out is not imminent. Diesel engines continue to play a crucial role in the heavy-duty pickup truck segment, and their dominance in this niche is expected to persist for at least the next decade. However, with the increasing focus on fuel economy, emissions standards, and the emergence of alternative propulsion technologies, the automotive industry is undoubtedly undergoing a transition.
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Heavy-duty diesel trucks have lower mpg than gas trucks
Heavy-duty diesel trucks have lower miles per gallon (mpg) than gas trucks. While diesel engines typically have better mpg than gasoline engines, this is not the case for heavy-duty trucks. Heavy-duty trucks are exempt from publishing EPA mileage, but real-world highway fuel economy tests have shown that diesel trucks burn less fuel, with an average of 18 mpg compared to 15 mpg for gas-fed models. However, it is worth noting that the difference in mpg between diesel and gas-fed trucks may be shrinking. The COVID-19 pandemic caused a gap in fuel prices, with diesel prices dipping below gasoline prices in some areas.
The lower mpg of heavy-duty diesel trucks compared to gas trucks can be attributed to their larger engines and heavier weight. Heavy-duty diesel trucks often have bigger engines, such as the Chevrolet and GMC Duramax diesel 6.6-liter V-8 and the Ford Power Stroke diesel 6.7-liter V-8. These larger engines contribute to higher fuel consumption. Additionally, the heavier weight of HD trucks can result in 1-2 mpg less than similarly-sized gas trucks.
The fuel economy of heavy-duty trucks is also influenced by their usage. Trucks used for towing or hauling will generally have reduced fuel economy. The drive cycle also plays a role, with refuse trucks and transit buses having lower fuel economy due to their frequent stop-and-go drive cycles. Class 8 trucks, which carry heavier loads but have more consistent drive cycles, also tend to have lower fuel economy.
To improve the fuel economy of heavy-duty diesel trucks, aftermarket diesel parts can be installed to enhance airflow and fuel flow efficiency. Proper maintenance of the truck and driving habits can also impact fuel efficiency. Additionally, the implementation of fuel economy and greenhouse gas emissions standards for medium- and heavy-duty vehicles aims to reduce diesel consumption and improve overall fuel efficiency.
In summary, heavy-duty diesel trucks generally have lower mpg than gas trucks due to their larger engines, heavier weight, and usage patterns. However, diesel trucks still offer advantages in certain applications, such as off-road fire trucks, where refueling may be necessary at the scene. The lower mpg of heavy-duty diesel trucks compared to gas trucks is an important consideration for fleet managers when making purchasing decisions.
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Heavy-duty vehicles have stricter fuel efficiency standards
The standards set fuel efficiency requirements for light heavy-duty (LHD), medium heavy-duty (MHD), and heavy heavy-duty (HHD) diesel engines. They also set requirements for heavy-duty gasoline engines. The US Environmental Protection Agency and the National Highway Traffic Safety Administration issued Phase 2 standards, which took effect in 2021 for most medium- and heavy-duty vehicle classes. These standards increase in stringency through model year 2027.
Phase 2 includes the first CO2 emission and fuel efficiency standards for trailers hauled by Class 7 and 8 tractor trucks. By 2040, the average fuel economy of new medium- and heavy-duty vehicles across all regulated classes is projected to reach 10.6 miles per gallon gasoline equivalent, representing a 33% improvement compared to the Reference case. This improvement is significant because refuse trucks, transit buses, and Class 8 trucks, which carry heavier loads, have relatively low fuel economy.
India has also implemented new fuel-efficiency standards for diesel-powered trucks and buses with a gross vehicle weight of 12 tonnes or more, which went into effect in April 2018. These standards aim to improve the fuel efficiency of heavy-duty vehicles and reduce their environmental impact.
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Heavy-duty diesel trucks have higher fuel consumption
The driving cycle of these trucks also impacts their fuel economy. Refuse trucks and transit buses, for example, have relatively low fuel economy due to their frequent stop-and-go driving patterns. Class 8 trucks, which carry heavier loads, can also experience lower fuel economy if they are consistently driving with heavy loads. The way a truck is equipped, the weight of the load, and whether it is towing a trailer can all significantly affect its fuel efficiency.
The specific engine and transmission of a heavy-duty diesel truck can also impact its fuel consumption. For instance, the Ram 2500's turbocharged 6.7-liter Cummins engine generates substantial torque but results in lower mpg. The Silverado 2500's 6.6-liter V8 Duramax engine, on the other hand, provides a smooth flow of power, making towing more efficient.
It is important to note that independent organizations like Consumer Reports and Car and Driver conduct real-world testing to gather data on the fuel economy of these trucks, as HD truck manufacturers are not required to report their fuel economy. Proposed standards by the U.S. Energy Information Administration (EIA) aim to reduce diesel consumption in medium and heavy-duty vehicles, with a projected reduction of 0.5 million barrels of oil equivalent per day by 2040. These standards will drive efficiency improvements and reduce greenhouse gas emissions.
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Frequently asked questions
The current standards for fuel economy in heavy-duty vehicles are the proposed Phase 2 standards, issued by the U.S. Environmental Protection Agency and the National Highway Traffic Safety Administration. These standards aim to increase fuel economy and reduce diesel consumption in medium and heavy-duty vehicles.
The proposed Phase 2 standards focus on improving the fuel economy of combination tractors, heavy-duty pickup trucks, and vocational trucks. By 2040, the average fuel economy of new medium and heavy-duty vehicles is projected to reach 10.6 miles per gallon, representing a 33% improvement compared to previous standards.
Improved fuel economy in heavy-duty diesel vehicles can lead to significant fuel savings, even with small improvements in miles per gallon. Additionally, reducing diesel consumption contributes to lower greenhouse gas emissions, specifically carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and hydrofluorocarbons (HFCs).
