The 2023 Peterbilt 579 is a bold redesign of an already trusted name in the trucking world. It’s not just an upgrade. It’s a clear signal that long-haul transport is moving into the future — with more efficiency, safety, and driver-focused features than ever before.
Design and Aerodynamics
The most noticeable change is the exterior. The sleeker, sculpted front end includes aerodynamic shaping, LED lighting, chassis skirts, and A-pillar fairings. These enhancements aren’t just cosmetic. The improved design cuts through air resistance and delivers up to 7–10% better fuel economy compared to earlier versions.
Powertrain and Performance
Under the hood, the 579 offers multiple engine choices, including the PACCAR MX-11, MX-13, and Cummins X15. Horsepower reaches up to 605, and torque maxes out at 2,050 lb-ft. The PACCAR TX-12 PRO transmission delivers smooth shifting and features useful capabilities like dual PTO, rock-free mode, and off-highway settings. For those who want to push efficiency even further, the optional EPIQ package adds advanced aerodynamic treatments that can push fuel savings even higher.
Safety and Driver Assistance
Peterbilt packed the 579 with advanced driver-assistance technology. Features include lane-keeping assist, automatic emergency braking, blind-spot detection, side object alerts, and highway-departure braking. There’s also the option for a Digital Vision System, which replaces traditional mirrors with cameras — improving visibility while reducing drag.
Cabin and Driver Comfort
Step inside and the upgrades continue. The 15-inch digital dash is fully customizable, and the SmartNav system keeps navigation, entertainment, and diagnostics at your fingertips. The UltraLoft sleeper is designed for life on the road, with over six feet of headroom, room for a 32-inch TV, microwave, and up to 70 cubic feet of storage.
Drivers have noted that the 579 feels lighter and more comfortable than previous models — in fact, it weighs nearly 1,000 pounds less. However, some have also pointed out that the use of more plastic components and occasional electrical issues suggest a few compromises were made in materials.
Durability and Maintenance
Peterbilt designed the cab with aluminum huck-bolted panels for added strength and reduced weight. Maintenance is easier thanks to tip-out fairings and tool-free access points. The PACCAR MX engines are engineered to last, with a projected life of 1 million miles. Fleet operators will appreciate the serviceability and long-term dependability.
Real-World Use
While the sleeper variants shine on long-hauls, some day cab operators have reported front-end wear issues that can appear before the 100,000-mile mark. That’s worth watching for those using the 579 in local or regional service. On the flip side, fully customized sleepers with kitchenettes, showers, and more are available from certain dealers, transforming this workhorse into a mobile living space.
Conclusion
The 2023 Peterbilt 579 delivers where it matters: fuel economy, driver comfort, safety, and power. It brings together modern technology and smart design in a way that appeals to both independent drivers and large fleet operators. While not perfect, especially for day cab applications, it’s one of the most advanced trucks on the road today.
Bottom Line
Ideal for long-haul efficiency and comfort
Impressive safety and technology suite
Worth considering the EPIQ aero and digital mirror upgrades
Keep an eye on wear patterns in non-sleeper configurations
If you’re looking for a high-performing, driver-friendly truck with future-ready features, the 2023 Peterbilt 579 should be at the top of your list.