![]() New wheel well closeouts accommodate a wider range of tire options.The A-pillar fairing directs air across the side of the cab to improve aerodynamics, reduce noise and enhance driver comfort.Sculpted mirror heads and arms not only improve aerodynamic efficiency but also allow the driver to see the top of the trailer while backing up.The new air dam below the bumper further improves aerodynamics without compromising ground clearance. ![]() The bold grille and bumper maximize aerodynamic performance, while the lower-sitting front end enhances visibility of the ground in front of the truck.The Model 579 offers the most advanced aerodynamic features and packages to improve fuel economy.and peak torque at low rounds per minute (RPM) Broad torque curve that delivers up to 1,850 lb.-ft.Fuel system efficiently optimizes combustion and decreases noise.High-performance thru-shaft pinion design that transfers full engine power straight to the road.Gear ratio coverage for slow-speed maneuvering.PACCAR MX engines deliver exceptional reliability and proven performance, whether in linehaul or vocational heavy-duty truck applications.They incorporate variable speed engine components and optimized combustion.These engines are designed to maximize MPG and achieve the lowest possible fuel consumption, emissions and noise levels.The PACCAR MX-13, PACCAR MX-11 and PACCAR PX-9 engines utilize a combination of proven technologies and state-of-the-art innovations.The integration of these components allows for effortless pulling, improved efficiency, enhanced fuel economy and increased driver comfort.It combines durable PACCAR MX engines and DX-40k tandem drive axles.The PACCAR powertrain offers an integrated solution for maximizing MPG and payload capacity.
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