Kenworth T680
Kenworth's aerodynamic flagship and a genuinely comfortable truck to live in, with the 76 inch sleeper among the better places to spend a night in this class. Fuel economy is close enough to the Cascadia that the difference is usually the driver.
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
PACCAR aftertreatment items, and a parts channel that runs through PACCAR dealers, which is thinner in some regions than the Freightliner network.
Verdict
Buy it for the cab if you are going to live in it, which is not a frivolous reason when the truck is also your bedroom. Check dealer coverage on your lanes first.
Others in aerodynamic linehaul
Freightliner Cascadia
7.2-92017 to present
Freightliner Cascadia (first generation)
6.2-7.42008 to 2017
Peterbilt 579
7-8.82012 to present
Volvo VNL
7.4-9.22018 to present
Mack Anthem
6.8-8.52017 to present
International LT
7-8.72017 to present
International ProStar
5.6-7.22008 to 2017
Western Star 5700XE
7-8.62015 to 2023