Kenworth vs Peterbilt: Key Differences & Best Choice (2025)

In the world of semi-trucks, few rivalries run deeper than Kenworth vs Peterbilt. Both brands carry a legacy built on durability, performance, and pride, and both sit under the PACCAR umbrella, sharing engines, components, and engineering DNA. But for fleet managers, truck owners, and owner-operators, the differences between the two are more than badge-deep.

Making the right choice between Kenworth and Peterbilt isn’t just about styling or spec sheets; it’s about how that truck performs in the real world. It’s about fuel consumption over hundreds of thousands of miles. It’s about uptime when deadlines are tight. It’s about driver comfort, repair access, resale value, and the operational goals that drive your bottom line.

If you’re a fleet operator managing multiple trucks, you may prioritize fuel costs, serviceability, and total cost of ownership. If you’re an owner-operator, you might care more about a comfortable cabin, long-hood styling, and how the truck holds value five years down the road. Whether you’re comparing Kenworth T680 vs Peterbilt 579, or weighing icons like the W900 vs the new 589, we break down everything you need to know: specs, strengths, 2025 updates, and the real-world pros and cons that matter most.

By the end, you’ll have the insights to make informed decisions and pick the truck that aligns best with your routes, your drivers, and your business.

Brand Background – Kenworth vs Peterbilt

Both brands share PACCAR engineering, but they’re built with different missions in mind. Kenworth is recognized for delivering reliable vehicles that are optimized for uptime and ease of service. Models like the W900 and T680 are engineered to meet the high-mileage demands of fleet operators hauling heavy loads across regional and long-haul routes.

Peterbilt, especially in the new 579 and 587, caters to drivers seeking a comfortable driving experience, with premium touches and a brand image that holds value in the resale market. Though their bones may be similar, including shared use of the PACCAR MX-13 engine, the brands take different approaches to helping customers meet their operational goals.

Exterior Design & Aesthetics

Kenworth’s aerodynamic design, particularly on the T680, prioritizes fuel savings. The sloped hood, narrow gap closures, and roof fairings help reduce fuel consumption, especially on highway runs. These features are key for cost-conscious fleet managers watching fuel costs climb.

Peterbilt’s 589, the successor to the 389, retains the long-hood look with bold chrome and customizable trim, appealing to truck owners who value legacy styling with modern upgrades. While less aerodynamic than Kenworth, its road presence remains a strong selling point

Interior Comfort & Driver Experience

Both offer modern safety features, digital dash displays, and collision mitigation systems, all of which are essential in today's semi-trucks. Kenworth keeps things ergonomic and efficient. In the T680, everything from seat position to visibility is engineered for a fatigue-reducing, comfortable driving experience. It’s a fleet-friendly build that supports productivity without distraction.

Peterbilt, however, ups the ante with the 579 and 589, featuring stitched leather trim, smart sleeper layouts, and touchscreen technology. These advanced features support drivers logging serious hours on long-haul routes and make a measurable impact on driver retention.

Performance & Drivetrain Options

Under the hood, both brands offer the PACCAR MX-13 engine, known for its durability, lower emissions, and high engine power with outputs of up to 510 HP and 1,850 lb-ft of torque. Cummins engines remain optional for fleets preferring legacy setups. Kenworth tunes its models, such as the T680, for optimal fuel consumption by pairing the MX-13 engine with aerodynamic enhancements and lighter builds, thereby maximizing the mileage of every gallon. Peterbilt’s 579 and 589 lean into drivability. Their powerful engines, responsive tuning, and smoother suspension setups give them the edge in driver satisfaction over long distances.

Maintenance, Uptime & Parts Support

Downtime eats margins, and both brands address it head-on. Kenworth’s design simplifies shop work. Trucks like the W900 feature straightforward component layouts, which reduce the time spent under the hood. Remote diagnostics help anticipate problems before they sideline your unit. Peterbilt’s 589 offers similar tech, but its intricate interior detailing can add steps during repair. Still, its diagnostics and dealer network help maintain competitive uptime.

At FleetsWorld, we carry parts for both platforms, from charge air coolers to lighting systems, ensuring you keep your semi-trucks running with minimal delay

Resale Value & Total Cost of Ownership (TCO)

Kenworth delivers where fleets feel it most: fuel costs, maintenance time, and predictable TCO. The T680 continues to lead in fuel efficiency, particularly compared to previous models, and helps large fleets manage their operating costs effectively. Peterbilt’s 589 leads in resale. It carries forward the visual appeal and prestige of the 389, giving truck owners a strong return when it's time to upgrade.

Bottom line:

• Choose Kenworth for lower fuel consumption, efficient serviceability, and long-haul ROI.
• Pick Peterbilt if you're focused on comfort, image, and future trade-in value.

Best Fit Use Cases – Which Truck for Which Job?

Each truck serves a role, and choosing the right one means aligning with your job, budget, and team.

What’s New in 2025: Model Updates & Innovations

Safety and Efficiency upgrades are front and center in 2025:

• Collision avoidance systems
• Adaptive cruise control
• Lane assist
• Advanced digital dash interfaces

Kenworth has refreshed its SmartWheel and sleeper ergonomics on the T680. Peterbilt has enhanced the SmartNav system and driver display in both the 579 and 589. Fuel-saving tweaks to truck mirrors, truck bumpers, and fairings contribute to aerodynamic design improvements, resulting in up to a 7% improvement in fuel economy compared to previous models.

And in the move toward sustainability:

• Peterbilt’s 579EV expands its electric options
• Kenworth’s hydrogen fuel cell trucks enter pilot programs for long-haul applications

Frequently Asked Questions

Which Is Better, Peterbilt or Kenworth?

Kenworth is ideal for fleets prioritizing efficiency and uptime. Peterbilt suits long-haul drivers wanting comfort, image, and resale value.

Are Kenworth Trucks Reliable?

Yes. Built for high-mileage routes and low-maintenance serviceability.

How Long Do Kenworth and Peterbilt Trucks Last?

With routine maintenance, both can exceed 1 million miles, especially with the MX-13 engine.

Who Makes Their Engines?

Both use PACCAR’s MX-11 and PACCAR MX-13 engines, with optional Cummins power.

Do They Offer Electric Trucks?

Yes. Peterbilt offers the 579EV. Kenworth is piloting zero-emission hydrogen powertrains for linehaul work.