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MODEL COMPARISON · REVIEWED SEPTEMBER 9, 2026

Kenworth T680 vs Peterbilt 579

Compare like-for-like diesel highway tractors. The T680 technical examples here use the 2019 factory catalogue; the 579 reference uses the later product catalogue and new-model brochure. This is a used-buyer decision framework across identified editions, not a same-model-year road test. For a later T680 or earlier 579, first use the generation research and VIN-linked build.
Separate subjects shown in matched editorial panels for Kenworth T680 vs Peterbilt 579
ConsiderationKenworth T680Peterbilt 579
Cab / sleeper2019 T680: day cab and 40, 52 or 76 in sleeper options.579 catalogue: day cab; 44, 58, 72 and 80 in discrete sleepers or integral 80 in UltraLoft.
Powertrain questionMX-11, MX-13 and X15 options in the dated catalogue; verify exact transmission pairing.MX-11, MX-13 and X15 diesel choices; distinguish TX-12/TX-18, Endurant and manual variants.
Dimensions2019 hood references: 119 or 125 in BBC; overall size is build-specific.Retained catalogue: 118 or 124 in BBC; UltraLoft size is not total tractor length.
Highway assignmentCheck the actual roof, fairings, rear ratio, tyre revs and hotel-load equipment.Check the actual roof, fairings, rear ratio, tyre revs and sleeper systems.
Service evidenceRequest serial-specific engine, transmission, aftertreatment and idle-management records.Request serial-specific engine, transmission, aftertreatment and SmartLINQ/service records where available.
Inspection focusInspect fairing mounts, sleeper seals and installed controls; reconcile original versus later cab equipment.Inspect hood and aero repairs, sleeper layout and fitted driver-assistance calibration records.
Decision evidenceLocal service access, mechanical findings and a written acquisition budget for this truck.The same evidence standard; brand or advertised sleeper size alone is insufficient.

Regional work: choose the cab you will actually use

For a home-daily route around Edmonton or the GTA, test the candidate in the type of yard and loading area it will serve. Compare physical wheelbase, mirrors, visibility and coupling clearance. A short sleeper may be useful for occasional layovers; otherwise price and maintainability may matter more than unused accommodation. Ask both sellers for the exact build and measure it, rather than infer manoeuvrability from a hood label.

Highway fleet: compare a repeatable specification

For interprovincial highway work, compare the same load, trailer height, cruise speed, driver arrangements and seasonal exposure. Match rear ratio, tyre specification, engine rating and transmission to that duty. Request route-based fuel and idle records with the same units and time window. Neither a manufacturer fuel-saving claim nor a single driver anecdote is a controlled T680-versus-579 test.

Owner-operator: price the condition findings

A lower purchase price can leave more room for a repair reserve, but only if the inspection bounds the likely work. Obtain written estimates for immediate defects, verify the scope and transferability of any warranty, and budget bunk climate systems, tyres and downtime. Choose the candidate whose evidence and budget fit your work. There is no universal winner when one truck has a different generation, duty history or maintenance condition.

Bring the comparison back to the build

Put the same cab requirement and maintenance evidence beside each build. If both carry PACCAR equipment, verify the installed engine and transmission rather than assuming identical service needs.

Kenworth T680 specificationsPeterbilt 579 specificationsKenworth manufacturer researchPeterbilt manufacturer researchKenworth T680 vs Freightliner CascadiaKenworth T680 vs Volvo VNLT680 vs 579 vs CascadiaInspect the shortlisted trucksCompare semi trucks: full model decision hub

Which should you buy?

The better purchase is usually the truck with the configuration, condition, maintenance history and price that best fit the intended work. Arrange an appropriate inspection and compare actual records before choosing.

Research both models

Kenworth T680Peterbilt 579T680 specifications and editions579 specifications and editionsOperating-cost calculatorInspection checklistPayment calculator

Sources & model references

Primary manufacturer material supports model context. Verify the applicable generation and individual build.

Kenworth T680 factory brochure, 2019Peterbilt new Model 579 introduction, 2021 powertrain contextPeterbilt Model 579 product informationKenworth T680 product information