2022 Peterbilt 579 – Cummins X15, 12-Spd Auto, 80″ Stand Up Sleeper with APU!

Looking for a highly efficient, driver-focused long-haul machine? This 2022 Peterbilt 579 is spec'd perfectly for comfort and maximum fuel economy over the road. Powered by the reliable Cummins X15 engine and an automated 12-speed transmission, this rig features a fuel-pinching 2.79 rear axle ratio.

Inside, the massive 80" Stand Up Sleeper and a factory APU ensure top-tier driver comfort while eliminating costly engine idling.

⚙️ Powertrain & Fuel Efficiency Specs

• Engine: Cummins X15 – 400 HP (The industry standard for reliability and ease of maintenance)
• Transmission: 12-Speed Automated Transmission (Smooth shifting, reduced driver fatigue)
• Rear Ratio: 2.79 Rears (Optimized for top-tier highway fuel economy)
• Engine Brake: 3-Stage Jake Brake

📋 Chassis, Tires & Setup

• Mileage: 411,701 (Original, documented highway miles)
• Wheelbase: 228”
• Suspension: Premium Flex Air Suspension (Delivers Peterbilt’s legendary smooth, premium ride quality)
• Fifth Wheel: Air Slide 5th Wheel
• Tire Size: 295/75R22.5 (Great rubber all around)

🛏️ Premium Driver Comfort & Amenities

The Model 579 is engineered around driver retention and premium comfort during long stretches away from home:

• Sleeper Size: Massive 80” Stand Up Sleeper offering incredible headroom, cabinet storage, and living space.
• Auxiliary Power Unit (APU): Equipped to run your sleeper’s climate control and electronics seamlessly without running the main engine—saving you thousands annually in fuel and wear.
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Seller's Note: This 579 is exceptionally clean inside and out. The combination of the X15 engine, automated 12-speed, and Flex Air suspension makes this one of the smoothest, easiest-driving trucks on the highway today. Fully inspected, clean title, and road-ready.