PACCAR MX-11
Around 400 pounds lighter than the MX-13 and aimed at regional and weight-sensitive work. Enough engine for most linehaul that is not heavy or mountainous.
Output
355-460 hp
1250-1700 lb-ft peak torque
Fuel per mile
$0.500
at 8.1 mpg and $4.049 a gallon
Fuel a year
$59,985
over 120,000 miles
In-frame overhaul
$18k-$26k
rough, and shop rates move it
In the exhaust
DPF and SCR
The first greenhouse gas phase targets the whole vehicle rather than the engine, so this era is as much about aerodynamics, tyres and axle ratios as combustion. Downspeeding becomes standard: tall gears, low cruise revs.
Known issues
The same aftertreatment items as the 13. Being worked harder than a 15 litre on the same load is a real consideration for longevity.
Verdict
The right answer for regional and bulk work where payload is money. The wrong answer if you routinely gross out over the Rockies.
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