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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.

GMC goes to the dark side with Terrain and Acadia Black Edition

GMC recognizes how many of its SUVs are customized immediately after purchase. It's not uncommon for a big SUV to be ordered in black, and then to receive a murdered-out look on top of that: black wheels, black tint, black trim. According to GMC, roughly 1 in 5 new SUV buyers gets their new vehicle customized, and to better serve those customers, GMC is now saving them the trouble of doing it aftermarket. As per GMC's statement: "Black Editions answer the specific desire for a blacked-out effect and come direct from the factory ingrained with distinct personality." Both the 2019 GMC Terrain and Acadia will be available in the special "Black Edition" from this summer on. They both feature blacked-out grilles, roof rails, mirror caps and trim. The Terrain's Black Edition, available on SLE and SLT spec, gets 19-inch gloss black aluminum wheels, and the SLT-only Acadia Black Edition gets 20-inch machined aluminum wheels with black accents. Despite the name, the Black Editions are both available in four colors other than just black — even if those are mainly shades of grey with an option for white as well. Related Video:

11 vehicles from Barrett-Jackson Las Vegas worth watching

This weekend will see the world's collector car crowds descend on Las Vegas, NV for one of the biggest shows on Barrett-Jackson's popular auction circuit. There are hundreds of vehicles up for bidding, ranging from a brand-new Lamborghini Aventador to a spattering of Art Deco classics and a huge swath of classic muscle cars.
While it's virtually impossible to assemble an inarguable list of the best cars coming during the three-day, 700-plus vehicle auction, we've sifted through the listings for this year's show - it was a tough assignment, we promise - and assembled a list of what we think will be some of the most interesting lots. We'll admit, it's a bit heavy on American iron, but if you browse BJ's listings, you'll come to a similar conclusion. Still, scroll down for our list of what we think will be the most interesting vehicles at the upcoming auction.