The 2021 GMC Sierra pickup truck gets a price correction that lowers the cost of the 3.0-liter turbodiesel engine by $1,500, compared to last year, the truckmaker announced Tuesday. New available trailering technology and a broader rollout of the six-way Multipro tailgate highlight the other changes for the 2021 model year. 

Introduced for 2020, the Sierra’s turbodiesel upcharge ranged from about $3,000-$5,000 on SLE, Elevation, SLT, AT4, and Denali trims. The fuel-efficient, heavy-hauling 3.0-liter turbodiesel inline-6 makes 277 horsepower and 460 pound-feet of torque, and paired with a 10-speed automatic transmission it is rated up to 30 mpg highway and can tow up to 9,100 pounds—not at the same time, of course.

That towing capacity falls just shy of what the 5.3-liter V-8 can tow in four-wheel drive, but that engine tops out at 21 mpg highway. That volume V-8 engine…

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