An In-Depth Review of the 2026 Kenworth T680
October 23, 2025 - 8:50:42 am

For years, the Kenworth T680 has been more than just a truck; it has been the definitive benchmark for on-highway performance, fuel efficiency, and driver comfort. As the industry continues to evolve, the expectations placed on a Class 8 truck have never been higher. Fleets demand maximum uptime and a low total cost of ownership, while professional drivers seek a workspace that is safe, comfortable, and technologically advanced. The 2026 Kenworth T680 is Kenworth’s powerful answer to these demands.

This is not just an incremental update; it is a thoughtful evolution of a modern classic. At Wallwork Truck Center, we have a deep, hands-on understanding of what makes a Kenworth "The World's Best®." This in-depth review will take you inside the 2026 T680, exploring the key pillars that solidify its position as the leader of the pack: uncompromising performance, intelligent fuel economy, next-generation safety, and an unparalleled driver environment.

The Pinnacle of Performance: The Integrated PACCAR Powertrain

The heart of the 2026 Kenworth T680 is the seamlessly integrated PACCAR Powertrain. This isn't just a collection of components from different manufacturers; it is a complete, harmonized system where the engine, transmission, and axles are designed to work together as one. This synergy is the key to the T680's exceptional performance and reliability.

• The PACCAR MX-13 Engine: The 12.9-liter PACCAR MX-13 engine continues its legacy of delivering an optimal balance of power and efficiency. For 2026, it features refined calibrations that improve thermal management and optimize performance across a wide range of operating conditions. With horsepower ratings of up to 510 hp and 1,850 lb-ft of torque, the MX-13 provides the strong, pulling power needed for steep grades while maintaining a remarkably quiet and smooth operation that drivers appreciate.
• The PACCAR TX-12 Transmission: This 12-speed automated manual transmission is the perfect partner for the MX-13. It offers exceptionally smooth and quick shifting, ensuring the engine is always in its most efficient power band. The transmission’s software is incredibly intelligent, utilizing predictive cruise control to anticipate terrain and make optimal gear selections, further enhancing both performance and fuel economy.
• PACCAR DX-40 Axles: The final link in the powertrain is the PACCAR DX-40 tandem rear axle. This lightweight, high-efficiency axle is designed to reduce energy loss and improve fuel economy. Its robust design and laser-welded components ensure long-term durability, even under the most demanding line-haul applications.

When these components work together, the result is a truck that is responsive, powerful, and incredibly efficient, delivering a driving experience that is second to none.

The Science of Savings: Fuel Economy and Aerodynamics

In today's market, fuel is one of the largest expenses for any fleet or owner-operator. The 2026 Kenworth T680 is a masterclass in aerodynamic design, engineered to slice through the air with minimal resistance and maximize every gallon of fuel.

Every curve and contour of the T680 serves a purpose. From the sculpted, aerodynamic hood and bumper to the full chassis fairings and tandem axle fairings that manage airflow along the entire length of the truck, no detail is overlooked. The optional Kenworth Digital Vision System takes this to the next level, replacing traditional mirrors with streamlined, high-definition cameras. This not only improves the driver's field of view but also significantly reduces aerodynamic drag, contributing to a measurable improvement in fuel economy. These aerodynamic advancements, combined with the efficiency of the PACCAR powertrain, make the T680 one of the most fuel-efficient trucks on the highway today.

A Commitment to Safety: Advanced Driver-Assistance Systems (ADAS)

The most important asset on any journey is the driver. The 2026 Kenworth T680 is equipped with a comprehensive suite of the latest ADAS technologies, designed to act as a vigilant co-pilot, enhancing driver awareness and actively preventing accidents.

• Kenworth Lane Keeping Assist: This system uses a forward-facing camera to detect when the truck is drifting from its lane and provides a gentle, torque-assisted steering input to guide the truck back to the center. This significantly reduces driver fatigue and the risk of lane departure incidents.
• Collision Mitigation: The advanced Bendix® Fusion® system combines radar and camera data to provide a complete picture of the road ahead. It offers forward collision warnings and can apply the brakes autonomously to help mitigate or prevent a rear-end collision.
• Adaptive Cruise Control (ACC) with Stop & Go: This intelligent cruise control system automatically adjusts the truck's speed to maintain a safe following distance. In heavy traffic, it can even bring the truck to a complete stop and then resume speed, drastically reducing the stress of stop-and-go driving.

The Driver's Sanctuary: Unrivaled Comfort and Technology

A comfortable and happy driver is a productive and loyal driver. The interior of the 2026 Kenworth T680 is designed to be the ultimate mobile office and home on the road, a key advantage in today's competitive driver market.

The command center is the stunning 15-inch High-Definition Digital Display. This fully customizable screen replaces traditional analog gauges with a crisp, clear, and intuitive interface. Drivers can choose their preferred gauge layout, monitor trip data, view real-time driver coaching, and even run through a comprehensive pre-trip inspection checklist, all from one central screen.

When the workday is done, the 76-inch high-roof sleeper provides a spacious and comfortable living environment. With premium seating options, extensive storage, an optional swivel passenger seat, and superior insulation for a quiet and restful space, the T680 sleeper is designed to be a true home away from home.

The Wallwork Truck Center Advantage

A truck of this caliber deserves a dealership experience to match. At Wallwork Truck Center, we don't just sell trucks; we build long-term partnerships. Our team of Kenworth experts will work with you to meticulously spec a 2026 Kenworth T680 that is perfectly tailored to your specific application and business needs. And our commitment continues long after the sale, with our network of factory-trained technicians and our extensive inventory of genuine PACCAR parts, all dedicated to maximizing your uptime.

The 2026 Kenworth T680 continues to set the standard for the modern on-highway truck. It is a powerful, intelligent, and sophisticated tool that delivers exceptional value to fleet owners and an unparalleled experience to drivers.

To learn more about the 2026 T680 or to start configuring the perfect truck for your fleet, contact the experts at Wallwork Truck Center today.