-To venture where no pickup truck in recent times has traveled, GM will soon put a 2.8-liter Duramax diesel engine into the Chevrolet Colorado and GMC Canyon engine roster. The goal is to reach 30 mpg—or better—in the EPA highway mileage test, thereby toppling the Ram 1500 EcoDiesel HFE from its perch as the highest-mpg pickup (with its ratings of 21 mpg city, 29 highway).
The GM “mid-size” (actually 7/8-scale) pickups’ new engine is a turbocharged and intercooled DOHC four-cylinder with an iron block and an aluminum head. Expect 181 horsepower at 3400 rpm and 369 lb-ft of torque at 2000 rpm (compared with the Ram 3.0-liter V-6 EcoDiesel’s 240 horsepower at 3600 rpm and 420 lb-ft also at 2000 rpm).
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- 2015 Chevy Colorado V-6 4×4 Instrumented Test: Little Big Truck
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- 2015 GMC Canyon 2.5L 4×4 Test: A Horse With Too Few Cylinders
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- Chevrolet Colorado News, Reviews, Photos, and Buyer’s Guide
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GM will import these 16-valve oil-burners from its plant in Rayong, Thailand, where similar pickups are manufactured and sold as Isuzus. To quicken response, the Duramax’s water-cooled turbocharger uses variable turbine-inlet geometry. Only one transmission, a six-speed automatic, will be offered. Expect EPA city ratings in the low 20s and highway numbers in the low 30s, for a combined figure of 26 mpg or better. The “over 30″ Colorado/Canyon pickups arrive at dealerships this fall.
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