Katerina Swanson
When it comes to diesel pusher motorhomes, there are several factors that can affect fuel mileage, including engine type, vehicle weight, and driving conditions. Diesel pushers, also known as Class A motorhomes, are known for their powerful engines, ample amenities, and comfortable living spaces. While these vehicles offer a range of benefits, their fuel economy can vary. On average, a diesel pusher can be expected to achieve between 6 and 14 miles per gallon, with some reporting mileage as low as 4 mpg and others reaching up to 10 mpg or more. The variation in mileage is influenced by a combination of factors, including engine specifications, such as the Cummins ISC8.3 or Cummins ISB6.7, and the weight of the vehicle, which can range from 24,000 to 48,000 pounds when towing.
| Characteristics | Values |
|---|---|
| Average Fuel Mileage | 7-10 mpg |
| Fuel Mileage Range | 4-14 mpg |
| Fuel Type | Diesel |
| Engine Location | Back |
| Braking System | Air Brakes |
| Towing Capacity | High |
| Loading | Proper and safe loading is essential |
| Maintenance | Less maintenance, higher cost |
| Price | $40,000 - $600,000 |
| Height | 12'1" - 13'3" |
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What You'll Learn
Diesel engines are more fuel-efficient than gasoline RVs
The average fuel mileage for a diesel pusher varies depending on the engine and weight. For instance, a Cummins 15L engine averages 4-6 mpg in a semi-power unit moving 80,000#. The average reported by the chassis/engine data bus is 8.5 mpg over 60,000 miles. Class A diesel pushers get between 6-8 mpg, regardless of their size.
Diesel engines also offer more torque at lower RPMs, which makes hill climbing and mountain driving easier. This added power boosts towing ability, with diesel pushers offering 2-3 times the towing capacity of a gas coach. The high torque of the diesel engine gives you a lot more horsepower at lower RPMs, and they are more efficient at pulling heavier loads. This puts less stress on the engine.
Diesel engines are also more durable than gasoline engines. Gas-powered engines require more service and have a shorter lifespan, usually lasting 150k-200k miles. Diesel engines, on the other hand, can be expected to last well beyond 400k miles, sometimes surpassing one million miles. This means that diesel engines offer more value over longer periods, and diesel-powered RVs tend to have higher resale values.
However, it is important to note that diesel engines are generally more expensive to maintain and may require specialized training to service. Additionally, diesel fuel is usually more expensive than gasoline, which can impact the overall running costs of a diesel RV.
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Fuel efficiency depends on the engine and weight
The fuel efficiency of a diesel pusher depends on a variety of factors, most notably the engine and weight.
Firstly, let's discuss the engine. Diesel engines are generally more fuel-efficient than gasoline engines, with a typical range of 7-12 miles per gallon, compared to 6-10 miles per gallon for gasoline engines. Newer diesel engine models are even more fuel-efficient and quieter, thanks to improved technology. Diesel engines also have a longer lifespan, often lasting beyond 400,000 miles, while gasoline engines typically last between 150,000 and 200,000 miles.
Now, let's turn our attention to weight. The larger and heavier a diesel pusher is, the more fuel it will consume. This is because the engine has to work harder to move a heavier vehicle, resulting in decreased fuel efficiency. Additionally, factors such as aerodynamics, driving speed, and road conditions can also impact fuel efficiency. For example, driving on hilly terrain or in strong winds can reduce fuel economy.
The weight of the diesel pusher also includes the weight of any cargo and passengers. By reducing the amount of cargo carried and maintaining a lower overall weight, fuel efficiency can be improved. Proper loading and weight distribution can also play a role in optimizing fuel efficiency.
Furthermore, the shape and design of the diesel pusher can influence its fuel efficiency. A more streamlined and aerodynamic design can reduce drag, leading to better fuel economy. Conversely, a squarish or boxy design may result in increased wind resistance, causing the engine to work harder and consume more fuel.
Lastly, the engine size and power also come into play. Smaller engines tend to be more fuel-efficient because they use less fuel, resulting in higher mileage. However, larger engines produce more horsepower and torque, making them better suited for towing and climbing hills. Therefore, when considering fuel efficiency, it's essential to strike a balance between engine size and power requirements.
In conclusion, when discussing the fuel efficiency of a diesel pusher, it's crucial to consider both the engine and weight factors. By selecting an appropriate engine size, maintaining a lower vehicle weight, and considering aerodynamic design principles, one can optimize the fuel efficiency of a diesel pusher.
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Newer models are more fuel-efficient
The average fuel mileage for a diesel pusher varies depending on the engine, weight, and driving technique. Generally, diesel engines are more fuel-efficient than gasoline RVs, with a diesel pusher achieving between 8 and 14 miles per gallon, while a gas motorhome typically achieves between 6 and 10 miles per gallon.
Newer models of diesel pushers are more fuel-efficient than their older counterparts. For example, a 25-year-old diesel pusher may average 10 miles per gallon, while a newer model may achieve closer to 14 miles per gallon. There are several reasons for this improvement in fuel efficiency:
Firstly, newer diesel engines are designed with improved fuel efficiency in mind. Manufacturers have opted for smaller, medium-duty diesel engines, such as the Cummins ISB6.7, instead of larger, heavy-duty engines. These smaller engines use less fuel while producing slightly less horsepower, resulting in higher mileage.
Secondly, newer diesel engines often feature improved technology that enhances fuel efficiency. For instance, the Cummins 15L engine is capable of achieving 4-6 miles per gallon in a semi-power unit, while newer diesel pusher engines can achieve 8-9 miles per gallon with the same horsepower. This improvement can be attributed to advancements in engine technology and design.
Moreover, newer diesel engines are equipped with urea injection systems, introduced in 2007 and becoming more common in 2010 models. These systems use urea to reduce emissions and provide cleaner exhaust. While this technology requires additional expenses and maintenance, it contributes to the overall fuel efficiency of the vehicle.
Additionally, the weight of a diesel pusher plays a significant role in its fuel efficiency. Newer models tend to have improved designs that optimize aerodynamics, reducing drag and enhancing fuel efficiency. Older models may have more squarish fronts and corners, impacting their aerodynamics and fuel mileage.
Furthermore, newer diesel pusher models often offer increased towing capacity. They can typically tow 10,000 pounds or more, while older models may be limited to 4,000-6,000 pounds. This higher towing capacity means newer models can efficiently handle heavier loads without sacrificing fuel efficiency.
In conclusion, newer models of diesel pushers are more fuel-efficient than older ones due to advancements in engine technology, design improvements, and the implementation of emission-reducing systems. These factors, combined with enhanced aerodynamics and increased towing capacity, contribute to the improved fuel mileage of newer diesel pusher models.
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Diesel fuel costs are higher
While diesel engines are generally more fuel-efficient than gasoline engines, diesel fuel costs are higher. The average gas motorhome gets around 6-10 miles per gallon, while a diesel RV will get you 8-14 mpg. However, the cost of diesel fuel has gone up significantly in recent years, and these large vehicles use a lot of fuel, so the costs can add up.
The bigger the motorhome, the more work it takes to keep it running efficiently. The size of your motorhome should be no more than you're willing and able to maintain. Diesel pushers are often more expensive than their gas-engine counterparts, with new models ranging from $250,000 to $600,000. Used models can be as low as $40,000-$60,000, even for higher-end options.
Diesel pushers have larger fuel tanks than gas motorhomes, with a capacity of 90 to 100 gallons, and dual fuel fills located on each side of the cab area. This is compared to a single fuel fill on gas motorhomes, which hold 80 gallons of fuel. The larger tank size in diesel pushers means you can go further on one tank of fuel, but it also means that you'll be paying more for each fill-up due to the higher diesel fuel costs.
While diesel pushers have higher fuel costs, there are other factors that can affect your overall fuel efficiency and driving experience. Diesel engines deliver more torque, making them better suited for climbing hills and pulling larger trailers. They also have air brakes, which provide more stopping power and are more reliable than the standard hydraulic disc brakes found on gas motorhomes. Additionally, diesel engines run at lower RPMs, resulting in less strain on the engine.
When deciding between a gas or diesel motorhome, it's important to consider your budget, the size and weight of the vehicle, and the features that are important to you. While diesel fuel costs are higher, the improved fuel efficiency, torque, and braking of diesel pushers may make them a more attractive option for those looking for a powerful and comfortable RV.
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Diesel pushers have better braking systems
The average fuel mileage for a diesel pusher varies depending on the engine and weight of the vehicle. For example, a diesel pusher with a Cummins ISC8.3 engine and a weight of 31,000 lbs averages 7 miles per gallon (mpg). Another diesel pusher with a Cummins 15L engine and a weight of 80,000 lbs averages 4-6 mpg. The average gas motorhome usually gets around 6-10 mpg, while a diesel RV typically achieves 8-14 mpg.
Now, let's discuss why diesel pushers have better braking systems.
Diesel pushers use air brakes, which offer several advantages over traditional hydraulic drum brakes. Firstly, air brakes eliminate the need for brake fluids, simplifying maintenance. They also provide ample stopping power to counteract the significant momentum of a diesel pusher RV. Additionally, air-powered disc brakes have superior heat dissipation capabilities, making them ideal for heavy coaches descending steep mountain grades. The heat build-up during such descents can be detrimental to traditional braking systems, but the air-powered disc brakes' superior heat management makes them highly reliable in these situations.
While disc brakes are generally considered more effective, some diesel pushers still use drum brakes or a combination of both. The disadvantage of disc brakes is that they are heavier and more expensive than drum brakes. However, disc brakes are more driver-forgiving, especially when navigating challenging terrain.
Toad brake systems are another essential aspect of diesel pusher braking. These systems are designed for vehicles being flat towed and rely on signals to activate the brakes. Some diesel pushers are configured to activate the towed vehicle's brakes when the auxiliary brakes are engaged, which can cause severe damage during long descents. To address this, the motorhome's auxiliary brake light application must be disconnected. The Air Force One air-activated setup is a recommended toad braking system for diesel pushers as it applies the brakes proportionally, ensuring a consistent and safe braking experience.
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Frequently asked questions
A diesel pusher is a type of motorhome or RV with a diesel engine. The engine is always near the back, which is why it is called a diesel pusher.
The average fuel mileage for a diesel pusher varies depending on the weight, engine, and size of the vehicle. The average gas motorhome usually gets around 6-10 miles per gallon, while a diesel pusher should get you between 7-14 miles per gallon.
The weight, engine, and size of a diesel pusher all affect its fuel mileage. Larger and heavier diesel pushers will typically get lower mileage than smaller and lighter ones. The type of engine also makes a difference, with newer models being more fuel-efficient than older ones.
Diesel engines are generally more fuel-efficient than gasoline engines, but the fuel efficiency of a specific diesel pusher will depend on its characteristics. Diesel pushers also have other advantages over gas motorhomes, such as better braking and towing capacity. However, diesel fuel is generally more expensive, and diesel engines may be more costly to maintain.
