Driven: Prototype 2011 GMC Sierra 2500 Regular Cab Duramax Diesel
While testing the latest heavy-duty pickup trucks during our 2010 HD Shootout comparison, General Motors showed up with a prototype 2011 GMC Sierra 2500HD regular cab work truck with the new 6.6-liter Duramax V-8 diesel for some high-performance fun at Milan Dragway. We drove it.
A two-door GM heavy-duty pickup with an 8-foot-long cargo box and Duramax oil burner is a $8,395 upgrade over the standard truck. The base engine is a 6.0-liter V-8 gas engine with 360 horsepower and 380 pounds-feet of torque.
The Duramax is the most powerful diesel engine in the segment, rated at 397 hp and 765 pounds-feet of torque. Put that mill under a regular cab Sierra HD’s hood and, according to Brent Deep, GM full-size truck development engineer, the truck isn’t just a workhorse; it’s also a fuel-efficient hot rod.
“We call the truck ‘the rocket,’” Deep said. “When we were putting [the idea for it] together, we were trying to beat the best fuel economy and performance [numbers] in all of today’s full-size pickup trucks, both light- and heavy-duty.”
Deep got close to meeting both of those objectives. He said that in “real world” testing – heavy-duty pickups aren’t required to carry EPA fuel economy labels – only the GMC Sierra 1500 Two-Mode Hybrid beats it for highway mileage, and the GMC Sierra Denali 1500 with the high-performance 403-hp, 417 pounds-feet 6.2-liter V-8 gas engine is faster in the quarter-mile.
To find out for ourselves how fast the prototype is, we got behind the wheel and timed it on the asphalt at Milan.
The fastest run of the day went to Johnny Fort, a senior financial analyst for Cars.com with the reflexes of a puma. Fort nailed the quarter-mile in only 14.79 seconds, beating journalists and truck engineers alike. He was the only person to break the 15-second barrier.
The best zero-to-60 time? According to Deep, it’s only 5.86 seconds. Not too shabby for a 6,522-pound work truck.
If you want a similar truck for your driveway or job site, it’s on sale now.
Update 1: July 22, 07:33 am PT
Corrected statement that said the Duramax diesel is a new option for RCLB. The same configuration has been available in previous models. H/T to Alex for pointing that out (again).

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