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US diesel $4.049 per gallonWeek ending Aug 17, 2026 · EIA
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Kenworth T680

Kenworth2013 to presentAerodynamic linehaul

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.