Kenworth W900L vs. Kenworth T680 Fuel Efficiency

Compare fuel efficiency of Kenworth W900L & T680 trucks. Help truck owners & fleet managers make informed decisions.


When it comes to the commercial trucking industry, fuel efficiency plays a crucial role in determining the success and profitability of a fleet. Two prominent contenders in this regard are the Kenworth W900L and the Kenworth T680. These heavy-duty trucks are renowned for their reliability, power, and performance, but they differ significantly in terms of fuel efficiency. In this blog post, we will discuss the technical details of the fuel efficiency of these trucks, providing valuable insights to truck owners and fleet managers who are looking to make informed decisions for their businesses.

Insight into Fuel Efficiency

Fuel efficiency is a critical factor that directly impacts operational costs and environmental sustainability in the trucking industry. It refers to the ability of a truck to deliver optimal performance while consuming the least amount of fuel. A truck with high fuel efficiency reduces operational expenses and minimizes greenhouse gas emissions, making it an eco-friendly choice.

When evaluating fuel efficiency, several factors come into play, such as engine performance, aerodynamics, weight, transmission, and tire specifications. Both the Kenworth W900L and the Kenworth T680 are designed with these factors in mind, but they have distinct features that set them apart.

Kenworth W900L Fuel Efficiency

The Kenworth W900L is a classic, long-nose conventional truck known for its powerful performance and iconic design. Its fuel efficiency is influenced by various factors, including engine choices, aerodynamics, and drivetrain configurations.

One of the significant contributors to the W900L's fuel efficiency is its engine options. The truck offers a range of engine choices, including the PACCAR MX-13 engine, which is designed for efficiency and performance. The MX-13 engine incorporates advanced technologies, such as variable geometry turbocharging and a high-pressure common rail fuel system, optimizing fuel combustion and reducing wastage.

Moreover, the W900L's aerodynamic design is essential in enhancing fuel efficiency. While its traditional long hood might not be as aerodynamic as some modern designs, the W900L compensates with other features, such as roof fairings, side extenders, and optional wheel covers, which help reduce drag and improve overall fuel economy.

The W900L's drivetrain configurations also play a role in its fuel efficiency. It typically offers various transmission options, including manual and automated manual transmissions (AMTs), allowing drivers to choose the one that best suits their driving style and load requirements.

Click here for more information on the Kenworth W900L. 

Kenworth T680 Fuel Efficiency

The Kenworth T680 is a contemporary, aerodynamically designed truck that focuses on maximizing fuel efficiency without compromising on performance. It is engineered to provide a balanced combination of power, comfort, and environmental responsibility.

The T680's fuel efficiency is predominantly attributed to its aerodynamic features. The truck's sloped hood, aerodynamic bumpers, roof deflector, and side fairings significantly reduce air resistance, helping it glide through the air with minimal drag. These features, combined with the carefully designed chassis and cab, make the T680 one of the most fuel-efficient trucks in its class.

Additionally, the T680 is often equipped with the PACCAR MX-13 engine, similar to the W900L. This engine's efficiency, when paired with the T680's lightweight design, contributes to impressive fuel economy figures, making it an ideal choice for long-haul operations where every gallon of fuel counts.

Click here to learn more about the Kenworth T680.

Comparing Kenworth W900L vs. Kenworth T680 

When comparing the fuel efficiency of the Kenworth W900L and the Kenworth T680, it's essential to understand their intended applications. The W900L is a versatile workhorse often preferred for heavy-duty, demanding operations, while the T680 is more focused on long-haul efficiency.

In terms of raw fuel efficiency numbers, the T680 tends to outperform the W900L on highways due to its aerodynamic advantage. However, in certain specialized applications where the W900L's power and flexibility shine, the difference in fuel efficiency might be narrower. Fleet managers and truck owners should consider the specific needs of their operations when choosing between these two models. If the majority of the routes involve long highway hauls, the T680's fuel efficiency might be more appealing. On the other hand, if the operation involves a mix of highway and off-highway driving, the W900L's robustness might be a preferred choice.

Ultimately, both trucks offer solid fuel efficiency figures, especially considering their class and capabilities. With proper maintenance and efficient driving practices, owners can further optimize fuel consumption for either model.


In conclusion, the fuel efficiency of the Kenworth W900L and Kenworth T680 depends on various factors, including engine options, aerodynamics, and drivetrain configurations. The W900L's classic design and versatile engine choices make it a powerful workhorse, while the T680's contemporary aerodynamics and lightweight design optimize long-haul fuel efficiency.

When choosing between the two models, truck owners and fleet managers must assess their specific operational needs and routes. For long-haul operations, the T680's superior aerodynamics and fuel efficiency might be the deciding factor. However, for applications that require a mix of highway and off-highway driving, the W900L's robustness and engine options might be more suitable.

Regardless of the choice, both Kenworth models exemplify the brand's commitment to delivering reliable and efficient trucks for the commercial trucking industry. With ongoing advancements in technology and engineering, future iterations of these models are likely to further improve fuel efficiency, benefiting truck owners, drivers, and the environment alike.

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