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Chevy Silverado, GMC Sierra 4.3-liter EcoTec3 V6 nets 18 mpg city, 24 highway

There is no doubting that fuel economy has become an important factor in the highly competitive fullsize truck market, with the Ford F-150 EcoBoost V6 and Pentastar V6-powered Ram 1500 setting quite a precedent in recent years. Now it's General Motors' turn. The General has just announced that the new base V6 used in the 2014 Chevrolet Silverado and GMC Sierra 1500 models will return an EPA-estimated 18 mpg city and 24 mpg highway in two-wheel drive trim, regardless of cab configuration.
While these figures don't go so far as to earn GM any "best-in-class" fuel economy claims (thanks to the 25-mpg Ram 1500 HFE), this new 4.3L EcoTec3 V6 does edge the F-150 and Toyota Tundra while boasting best-in-class numbers for torque, payload and towing capacity among six-cylinder rivals. This all-new engine produces 285 horsepower and 305 pound-feet of torque, and it gives the 2014 Silverado and Sierra the highest towing rating among standard V6 models with a 7,200-pound towing capacity - besting the Ram by 700 pounds, the base F-150 by 1,100 pounds and coming within 200 pounds of the V8-powered Nissan Titan. Scroll down for the official press releases from Chevrolet and GMC.

GM diesel pickups first to undergo extra EPA, CARB testing

The effects of Volkswagen's long-running diesel emissions evasion are starting to spill over to other automakers, but General Motors is taking things in stride. The 2.8-liter, four-cylinder Duramax in the 2016 Chevrolet Colorado and GMC Canyon is the first engine to get extra scrutiny by the Environmental Protection Agency and the California Air Resources Board, Automotive News reports. Rather than just the usual in-lab test, it's also being checked on the road. However, the extra evaluation shouldn't have any impact on when the trucks with his mill hit dealers later this fall. "We're in our final stages of the EPA certification, and our launch is on track," Chevy spokesperson Otie McKinley tells Autoblog. The four-cylinder diesel in the trucks makes 181 horsepower and 369 pound-feet of torque, and the automaker is touting low NOx production. In the announcement for the Colorado's specs, the company calls it "the cleanest diesel truck engine ever produced by General Motors." The tech includes exhaust gas recirculation to lower combustion temperatures and improve emissions. There's also a urea tank like on the bigger diesels for full-size trucks, and it gets refilled in time with oil changes. An indication on the instrument panel lets drivers know when that's needed, too. Even with the more demanding testing, the company doesn't seem too worried about the four-cylinder passing. "Part of our development process is on-road and off-road [laboratory] testing," Scott Yackley, Chevy Trucks assistant chief engineer, said to Automotive News. In the wake of the VW scandal, the EPA has pledged more rigorous testing. Before, on-road emissions evaluations were largely limited to heavy-duty vehicles, but the agency has decided to apply the checks more often to other models. There's also now greater cooperation with Canadian authorities.

GM might outsource vans to AM General

General Motors will possibly boost production of the Chevrolet Colorado and GMC Canyon at the Wentzville Assembly Plant in Missouri by contracting out some commercial van manufacturing to AM General. Demand for the two midsize trucks continues to boom, and GM would like to take advantage of the strong market for them. The possible deal came to light in a letter to workers at the factory, according to Automotive News. "This potential partnership would free up production capacity and allow the organization to capitalize on our ability to build midsize trucks to further satisfy customer demand," a portion of the document allegedly said. AM General would reportedly only take over assembly of the cutaway versions of the Chevy Express and GMC Savana. Customers and critics have quickly embraced the latest Colorado and Canyon since their introduction. The Chevy just won back-to-back Motor Trend Truck of the Year awards. GM also had to add a third shift and extra workers in 2014 just to keep up with demand. The Wentzville plant even increased employment on the weekends earlier in 2015 to assemble an extra 2,000 of the trucks each month. While the two pickups boom, deliveries for the Chevy Express and GMC Savana are down 26.9 percent and 26.6 percent respectively through the first 10 months of the year. GM doesn't break out numbers for the cutaway versions, but they make up about a third of production, according to Automotive News. AM General built the Humvee for the US military and does some contract work with automakers. For example, the company's Indiana factory now produces the Mercedes-Benz R-Class for export to China. Here's hoping this potential deal will help both GM and AM General keep their factories humming. Related Video: