Peterbilt 579

Peterbilt2012 to presentAerodynamic linehaul

Mechanically the T680's sibling under PACCAR, with different sheet metal and a different interior philosophy. The UltraLoft sleeper is among the largest offered.

Fuel economy

7-8.8 mpg

loaded, at highway speed

Fuel per mile

$0.513

at $4.049 a gallon

Tractor weight

17,000-19,500

pounds, day cab to large sleeper

Used asking

$50k-$130k

condition moves this more than the model

What the fuel gap costs

Against the most efficient tractor in this reference, over 120,000 miles at this week’s diesel price.

$2,964 a year

Known issues

The same PACCAR aftertreatment items and the same dealer network consideration as the T680.

Verdict

Choose between this and the T680 on the cab, the dealer nearest your lanes and the deal in front of you. There is no engineering argument that separates them.