2008 Gmc Sierra 1500 Sle on 2040-cars

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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

GM's fullsize SUVs boost highway mileage by nearly 10 percent

We met the redesigned 2015 versions of the Chevrolet Suburban and Tahoe, and the GMC Yukon and Yukon XL at the 2013 LA Auto Show. Improved gas mileage numbers have been announced to go along with the improved exteriors and interiors, with city mileage improving by seven percent and highway mileage going up by nearly ten percent; you'll now get 16 miles per gallon in the city and 23 on the highway.
The only applies to models with the 5.3-liter engine, though, not the premium Yukon Denali and Yukon XL Denali SUVs with the 6.2-liter motor. Still, the 5.3 gets you more power than previously, with 355 horsepower and 383 pound-feet of torque underfoot, on top of the improved fuel economy numbers. The 6.2-liter sticks with official mpg ratings of 15 highway, 21 city. There's a brief press release below with words straight from the horse's mouth.

Hummer EV SUV overland camper teased from GMC and EarthCruiser

At the end of March this year, GMC announced a collaboration with EarthCruiser. The automaker's Hummer team would work with the Oregon overlanding company's research and design division to develop an upfit for EVs, initially integrated into the Hummer EV pickup. For those not familiar with EarthCruiser, they’ve made wild overlanding vehicles like the Terranova, FX and EXP, pretty rad and pretty expensive stuff. The preview back then was a shadowy render that looked much like the silhouette of the Hummer SUV thanks to the living quarters slid into the pickup bed. The most apparent changes were solar panels integrated into the roof, and a cargo bay on the side of the slide-in. The duo's just put a much better tease on Instagram revealing the campfire-lit outline of what this version of an overland Hummer will look like. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. EarthCruiser is known for its pop-up roofs. This looks like a choice execution here, with near 360-degree visibility and integrated LEDs. Also, dig what looks like a platform off the back of the rig. We're going to guess that's either a slide-out or the rear flap on the camper top locked into the raised position. The cargo boxes on the side look neat, we look forward to finding out how they work and what they store. We also wonder if they'll be optional and whether they extend beyond the wheel arches, making a really wide pickup truck even wider.  We're not sure it will be "every overlanderÂ’s dream," but we are sure some stargazers are going to have some very sweet dreams in it. Slated for debut this month, look for it at Overland Expo Mountain West in Colorado, the same place the GMC Canyon AT4X OverlandX made its public debut in 2021, and where in Arizona last year the GMC showed the Sierra's outdoor potential with an Ultimate Overland Vehicle built on the Sierra 1500 AT4X.  Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.