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2018 GMC Acadia with 'Christmas Aero' modification gets in the wind tunnel

Tis the season of "Big" - big cheer, big parties, big bowls of eggnog, big decorations, and when it comes to your family hauler, big drag. Festive drivers who festoon their crossovers, minivans, and SUVs with wreaths, Rudolph noses, fuzzy antlers, and rooftop Christmas trees undo the years of work that car engineers devote to fractional gains in fuel economy. To put numbers to such fuel-guzzling madness, GMC started with a 2018 Acadia, optioned it with the Xmas Aero Package - both Standard and Plus versions - put it in Lockheed-Martin's wind tunnel. The resulting dip in fuel economy results probably won't surprise anyone who's used a roof rack - or, for that matter, their car's air conditioning. However, it might surprise you to find out which seemingly substantial decoration had no effect, and which seemingly innocuous decoration was about twice as bad as running the A/C on its Mr. Freeze setting. Check out the brief video above for the results. And consider placement of that bow carefully.

2024 GMC Hummer EV SUV revealed, priced the same as the truck

Following up on the 2024 GMC Hummer EV pickup truck's big reveal back in October is the SUV variant. And it looks pretty much the way you would expect. From roughly the doors forward, it's the same as the blocky pickup. But the back half now has an enclosed cargo area, a full-door tailgate and full-size spare mounted to it. Besides the tweaked looks, the SUV is physically shorter. The full dimensions haven't been revealed yet, but the wheelbase is 8.9 inches shorter than the truck at 126.7 inches total. The overall length is likely reduced even further, since the tail is much shorter than the truck's with the rear wheels close to the bumper. Both of these changes will greatly improve breakover and departure angles, plus make the vehicle generally more maneuverable on and off road. GMC boasts that with four-wheel-steering, the turning circle is just 35.4 feet, about a foot and a half tighter than the truck. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Powertrains are identical to that of the truck. The EV2 and EV2X get two motors making 625 horsepower. Higher EV3X and Edition 1 trims have three motors making 830 horsepower. Electric range varies between about 250 miles to 300 miles depending on specification. Extremely fast 800-volt, 300-kW DC fast charging is available and included on all but the base trim level. An Extreme Off-Road Package is available on EV2X and above that adds 18-inch wheels with 35-inch mud-terrain tires. You'll also be able to get the ground-clearance-increasing air suspension and four-wheel steering with the famous Crab Mode. Super Cruise will be standard on every GMC Hummer EV. Pricing and trim levels are nearly identical to the pickup truck, with only the Edition 1 varying. The base model starts at $79,995, and each trim and price is listed below. Prices are listed without the destination charge because that figure has not been revealed yet. EV2: $79,995 EV2X: $89,995 EV3X: $99,995 Edition 1: $105,595 ($110,595 with Extreme Off-Road Package) The Edition 1 SUVs will be available first with sales starting early next year. The EV2X and EV3X will go on sale that spring, and the base EV2 trims will go on sale in spring 2024. GMC is taking reservations now, and they can be made at this link. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

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.