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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.

2016 GMC Sierra Denali Ultimate wants to take even more off the top

What do you do when getting to the top of Denali isn't enough? You create a higher peak called Denali Ultimate. That's what GMC has done with the 2016 Sierra, the new Sierra Denali Ultimate adding even more content and showing off the truck's refreshed face and new Denali grille. The reasoning behind this truck is perfectly sane. GMC says that in 2013 it had zero percent of the premium light-duty truck market; since that time, the brand says the segment (with an average transaction price beyond $55,000) has grown by a factor of ten, and the Sierra Denali has given GMC a 15.5-percent share. When it goes on sale in in the first quarter of next year, it can be optioned on the four-wheel drive 1500 Crew Cab with either the five-foot-eight or six-foot-six-inch bed. Standard equipment includes a sunroof, Lane Keep Assist, automatic headlights, Tri-Mode Power Steps, chrome tow hooks, and 22-inch wheels. The press release below has more. GMC Sierra Denali Ultimate: The Pinnacle of Premium Unique 22-inch wheels, expanded package of standard content drives exclusivity DETROIT, Tuesday, Nov. 17, 2015 – GMC is taking the range-topping style, craftsmanship and capability of the Sierra Denali even higher with the 2016 Sierra Denali Ultimate. It builds on the Sierra Denali's already class-leading attributes with a package of precision-crafted features designed to elevate its comfort, design and capability in the growing premium niche of the full-size truck market. GMC introduces the Sierra Denali Ultimate today, ahead of its public debut at the Los Angeles Auto Show. It goes on sale late in the first quarter of 2016. "The Sierra Denali has helped drive the growth of premium portion of the light-duty crew cab segment," said Duncan Aldred, vice president of GMC Sales and Marketing. "This truck is the ultimate expression of the Sierra Denali with greater emphasis on the bold and refined presence and advanced features that make Denali models synonymous with precision and exclusivity." Thanks in large part to Sierra Denali, which was redesigned in 2014, GMC commands 15.5 percent of the premium full-size truck segment, where average transaction prices exceed $55,000. The segment has nearly doubled in 2015 and grown tenfold since 2013, when GMC had zero percent of the market. In fact, Sierra Denali has helped GMC earn a higher share of the premium portion of the light-duty crew cab segment than of the overall full-size pickup segment.

2016 Green Truck of the Year, Commercial Green Car of the Year finalists

Not only are commercial-grade haulers getting more green love lately, they're getting more different kinds of green love. The 2016 Green Truck of the Year, the second time the award has been handed out, is being decided by judges from Green Car Journal and the San Antonio Auto & Truck Show. This year the award is joined by the new 2016 Commercial Green Car of the Year, which crowns one of the little vans increasingly used by small business as cargo and delivery vehicles. The Green Truck of the Year finalists are the Chevrolet Colorado Duramax (pictured), Ford F-150, GMC Canyon Duramax, Nissan Titan XD, and Toyota Tacoma. The first three of those were on last year's list, but since they are completely new or upgraded for 2016 - Ford with its all-aluminum body, the General Motors twins with the new diesel Duramax engine - they qualify for entry again. The Ram 1500 EcoDiesel won last year. The Commercial Green Car finalists are the Chevrolet City Express, Ford Transit Connect, Mercedes-Benz Metris, Nissan NV200, and Ram ProMaster City. You can read more details in the presser below, and the awards will be announced in San Antonio sometime during the show from November 19-22. San Antonio Auto & Truck Show Announces 2016 Green Truck of the Year and Commercial Green Car of the Year Finalists SAN ANTONIO, Oct. 22, 2015 /PRNewswire/ -- Green Car Journal and the San Antonio Auto & Truck Show have announced finalists for the 2016 Green Truck of the Year™ and 2016 Commercial Green Car of the Year™ awards. The Green Truck of the Year™ nominees are the Chevrolet Colorado Duramax, Ford F-150, GMC Canyon Duramax, Nissan Titan XD, and Toyota Tacoma. Vying for the all-new 2016 Commercial Green Car of the Year™ award are the Chevrolet City Express, Ford Transit Connect, Mercedes-Benz Metris, Nissan NV200, and Ram ProMaster City. "Over the past few decades, new car models have benefitted from design and technology improvements that have brought higher fuel efficiency and greater levels of environmental compatibility," said Green Car Journal and CarsOfChange.com Editor and Publisher Ron Cogan. "With models like these ten deserving finalists, we're witnessing the pickup and light commercial vehicle field enjoying the same attention." The new Commercial Green Car of the Year™ award is part of an expanded awards program presented at this year's 2015 San Antonio Auto & Truck Show.