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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.

2021 Chevy Tahoe, GMC Yukon fuel economy and towing capacities go official

Most of the puzzle pieces have fallen into place with GM’s new full-size SUVs, but today we have fuel economy and towing to add to the picture. Numbers for the standard 5.3-liter V8 and upgrade 6.2-liter V8 are out, but GM has held back on the 3.0-liter turbodiesel inline-six for the time being. Those numbers are most likely not ready yet. Minor improvements and decreases are seen throughout the Tahoe/Suburban and Yukon/Yukon XL lineup. Because there are so many variants, weÂ’re going to just lay them out below for you. 5.3-liter V8 2021 Tahoe/Yukon 2WD: 16/20/18 2021 Tahoe/Yukon 4WD: 16/20/18 2021 Suburban/Yukon XL 2WD: 16/20/18 2021 Suburban/Yukon XL 4WD: 15/19/17 6.2-liter V8 2021 Tahoe/Yukon 2WD: 15/20/17 2021 Tahoe/Yukon 4WD: 14/19/16 2021 Suburban/Yukon XL 2WD: 15/20/17 2021 Suburban/Yukon XL 4WD: 14/19/16 As you can see, there isnÂ’t a whole lot of difference between two-wheel drive and four-wheel drive options. You can eke out an extra mpg here and there, but itÂ’s a penalty weÂ’d be happy to live with to have four-wheel traction. The biggest loser in all of this is highway mpg. Chevy has made the trucks bigger and added weight with the independent rear suspension, causing a decrease in fuel economy. For example, a 2020 Tahoe with the 6.2-liter V8 and four-wheel drive is rated at 14/22/17. The 2021 truck drops 3 mpg on the highway and 1 mpg in the combined rating. There are improvements to be found, though. A 2020 Suburban with the 5.3-liter V8 and four-wheel drive is rated 14/21/16. Fuel economy in the city goes up 1 mpg, but you lose 2 mpg on the highway and 1 mpg in the combined rating. ThereÂ’s a bit of give and take here, but at least a slight increase in city mpg has accompanied the greater loss in highway fuel economy. 2021-chevy-tahoe-chicago-01 View 12 Photos As for towing, the Tahoe/Yukon with the 5.3-liter V8 and two-wheel drive has a new 7,900-pound capacity, and the four-wheel drive model is rated at 7,700 pounds. Respectively, those are the best figures youÂ’ll get with the standard towing capacity. Opt for the maximum towing package, and the Tahoe/Yukon capacities go up to 8,400 pounds (two-wheel drive) and 8,200 pounds (four-wheel drive). The numbers all take slight cuts when you go for the 6.2-liter V8. Both the Suburban and Yukon XL offer similar or identical towing figures as their shorter counterparts do.

GMC confirms Hummer EV will be joined by an electric Sierra, or Sierra-like, pickup

GMC will step into the electric vehicle arena for the first time when it begins building the Hummer EV in 2021. While it's not planning on becoming an electric-only brand, it has more battery-powered models in the pipeline. "There will be an all-electric Sierra pickup, but no timeline yet. But, the plan is to make it electric; this whole electric thing is a moving target," Lynn Thompson, the president of a Buick-GMC-Cadillac dealership in Missouri, told the Detroit Free Press. He said executives revealed those plans during a national dealer meeting. What remains to be seen is whether the truck will be an electric variant of the Sierra as Thompson said, or if it will arrive as a standalone electric truck with Sierra-like dimensions and capabilities. Sister company Chevrolet is also planning to launch an electric pickup in the coming years, and it strongly hinted it will take the second route. Its entry into the segment won't look like a Silverado, and nothing seriously suggests it will be badged as one. It will also be interesting to watch how GMC ensures that the truck doesn't overlap with the Hummer EV, which will exclusively be offered as a four-door pickup with a relatively short cargo box when it arrives in stores as a 2022 model. Our crystal ball tells us the Hummer will be marketed as a more expensive model aimed at weekend adventurers who want to make a statement, while the Sierra-like model will be cheaper and primarily aimed at buyers who merely want a truck, whether they're commuters, contractors, or fleet operators. Chevrolet's entry into the segment will slot beneath these two models. General Motors used this strategy nearly 20 years ago to keep the Hummer H2, the GMC Yukon, and the Chevrolet Tahoe in separate corners of the same room. GMC's electric truck could share powertrain and chassis components with the Hummer EV. It might also be built in the same Hamtramck, Michigan, factory that parent company General Motors is funneling $2.2 billion into. Regardless of the path it takes, GMC is not going all-electric. "[GMC boss] Duncan [Aldred] said we're certainly not going to abandon our internal combustion engine vehicles because that's our core business, and that was good to hear. It's to let people know they're not going down the same road as Cadillac," a dealer who asked to remain anonymous said. Cadillac might go EV-only by 2025, starting with a crossover named Lyriq, and many of its dealers have refused to spend $200,000 on upgrades.