2014 Gmc Sierra 1500 Sle on 2040-cars

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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.

2014 GMC Sierra Regular Cab revealed

Despite initially launching in just the Crew Cab configuration, the lineup of 2014 GMC Sierra and 2014 Chevrolet Silverado trucks will eventually grow to include three cab sizes and three bed lengths. Oddly enough, our first look at the Regular Cab bodystyle has arrived in a General Motors press release discussing the aerodynamics of the new truck, with an image showing a Sierra Regular Cab testing in the wind tunnel. GMC's website says that Regular Cab and Double Cab models will be available by summer.
While it really didn't take too much imagination to figure out what the two-door version would look like, this Regular Cab Z71 looks pretty sharp with its standard-length (6.5-feet) bed - a longer bed will also be offered. In regards to the aero tuning of the 2014 Sierra, these images show just how far GM has gone in maximizing the truck's fuel efficiency and reducing its noise, vibration and harshness (NVH) levels. Interestingly, the press release shows visual evidence that keeping the tailgate up is best for aero - there's always been some Mythbusters-level contention about such things -but GM also says that adding tonneau covers (preferably soft) and running boards can also help improve the overall aerodynamics. Scroll down for all of this aero info in the official press release.

GMC Hummer EV could have had the Chevrolet Avalanche's Midgate

One of the many rumors swirling around the GMC Hummer EV claimed the truck would resurrect the Midgate inaugurated by the original Chevrolet Avalanche. Although we now know there's no way to fully knock down the partition between the cab and the cargo box, the firm revealed the rumor wasn't entirely false. "There was [a Midgate] early on. We opted for the functionality of the drop glass in the back. With the package layout and things like that, it was not advantageous to pursue that one. And, the five-foot bed was kind of the industry standard in regards to price of entry in that segment," explained John Mack, the Hummer's exterior design management, during an interview with Muscle Car & Trucks. The Hummer will go on sale with a five-foot box, and it doesn't sound like a longer bed will be available, so a modern version of the Midgate would have made the model more versatile by giving users the ability to fold down the partition behind the rear seats to carry bulky items, like plywood and ATVs. It's a feature that would have inevitably made the truck more complicated to build, however, because it adds moving parts that need to be sealed. Hinges, seals, and latches in turn add weight, and complexity almost always invites high manufacturing costs. As an electric pickup built with newly-developed components, the Hummer already has enough of each. Motorists who need to carry something that's significantly longer than the cargo box aren't entirely out of luck. As Mack pointed out, the rear window drops into the partition, so owners will have the ability to haul surfboards, lumber, or anything else that's relatively long and reasonably thin by simply pushing a switch. Alternatively, the only thing limiting cargo space when the roof comes off is the sky — or, depending on where you live, bridges. Mack didn't reveal when the Midgate was dropped. GMC launched the Hummer project in April 2019, and it previously released early design sketches that show how the truck transitioned from a sketch to a prototype. As of writing, nothing suggests the Midgate will make a comeback in the near future on any member of the General Motors portfolio. It was introduced in 2001 on the first-generation Chevrolet Avalanche, which went on sale in the United States for the 2002 model year. It later spread to Cadillac's luxed-up variant of the truck, the Escalade EXT, and to the short-lived GMC Envoy XUV.