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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.

Best and Worst GM Cars

Oh yes, because we just love receiving angry letters from devoted Pontiac Grand Am enthusiasts, we have decided to go there. Based on a heated group Slack conversation, the topic came up about the best and worst GM cars. First of all time, and then those currently on sale, and then just mostly a rambling discussion of Oldsmobiles our parents and grandparents owned (or engineered). Eventually, three of us made the video above. Like it? Maybe we can make more. Many awesome GM cars are definitely going unmentioned here, so please let us know your bests and worsts in the comments below. Mostly, it's important to note that this post largely exists as a vehicle for delivering the above video that dives far deeper into GM's greatest hits and biggest flops, specifically those from the 1980s and 1990s. What you'll find below is a collection of our editors identifying a best current and best-of-all-time choice, plus a worst current and worst-of-all-time choice. Comprehensive it is not, but again, comments. -Senior Editor James Riswick Best Current GM Vehicle Chevrolet Corvette We were flying by the seats of our pants a bit in this first outing and my notes were similarly extemporaneous. When it came time to tie it all together on camera, I failed spectacularly. Thank the maker for text, because this gives me the opportunity to perhaps slightly better explain my convoluted reasoning. I chose the C8 Corvette because it's simply overwhelmingly good, and it's merely the baseline from which this generation of Corvette will be expanded.  While the Cadillac CT5-V Blackwing (more on that in a minute) is an amazing snapshot of GM's current performance standing and its little sibling so enraptured me that I went out and bought one, their existence is fleeting. Corvette will live on; forced-induction Cadillac sport sedans, not so much. So while all three are amazing machines when viewed in a vacuum, the Corvette stands above them as both a reflection of GM's current performance credentials and a signpost of what is to come. So, given the choice between the C8 and the 5V-Blackwing right now, I'd choose the C8. In 10 years, when the Blackwing is no longer in production and Corvette is in its 9th generation? Well, that might be a different story. Now, just pretend I said something even remotely that coherent when we get to the part of the video where I try to make an argument for the 5-V Blackwing as best GM car I've ever driven. Or just laugh at me while I ramble incoherently.

New GM subcompact SUV spied, could be a Chevy or GMC

GM's pair of subcompact crossovers have been trundling along for a while now. The Buick Encore was the first for Americans in the 2013 model year, and the Chevy Trax that was based on the Encore (an encore of the Encore, if you will) arrived for the 2015 model year. Each has undergone a mild update, but these spy photos could indicate their replacements are in the works. Or not. For starters, we can't be sure which GM brand this new SUV is destined for. Though the timing and its flowing lines could indicate Buick, the thick horizontal bars visible in the grille would indicate otherwise. The next Encore being at least related to this is at least a possibility. Making the case for GMC are those thick grille bars, the fact that it extends far below the lights, and may even rise above them, similar to the Acadia. And that rising beltline isn't that different from that of the Acadia. Arguing against the GMC idea is the Encore, which is almost always sold in GMC-Buick combo dealers. Much as the Acadia was made smaller to eliminate confusion and in-house competition with the Enclave, it's hard to see GM opting to resurrect such an issue at the bottom end of the SUV market. That means we're leaning toward this little SUV wearing a Chevy bowtie. The split grille with a large lower section and small upper section is the brand's current design language, as seen on the new Malibus and Cruzes. The shape is vaguely Equinox-like. And like Buick, Chevy also has a subcompact crossover ready for replacement: the Trax. Now, our photographer reports he's seen another subcompact testing that has Blazer design cues, but in this crossover-hungry market, we wouldn't be surprised if two similarly sized but differently styled Chevy crossovers make the grade. It's a strategy that's working pretty well for Jeep. We'll no doubt be seeing more of these disguised test vehicles milling about the country in the coming months, so perhaps we'll eventually get a better idea of what this is before more official information starts trickling out within one or two years. Related Video: Featured Gallery GM Subcompact Crossover spy shots View 10 Photos Image Credit: SpiedBilde Spy Photos Buick Chevrolet GM GMC Crossover SUV buick encore chevy trax