2007 Gmc Yukon Denali Sport Utility 4-door 6.2l 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.

GM 6.2L EcoTec V8 rated at 21 mpg by the EPA

General Motors is already laying claim to best-in-class power for its new 6.2-liter V8 that will be offered in the 2014 Chevy Silverado and GMC Sierra this fall, and now it has released fuel economy numbers for the big engine. Available as an option on the Silverado LTZ and High Country (shown above) models as well as the the Sierra SLT and Denali trims, the 6.2L EcoTec3 V8 will return 15 miles per gallon in the city and 21 mpg on the highway on rear-wheel-drive trucks; these numbers drop by one mpg each on four-wheel-drive models.
These estimates are in addition to the engine's 420 horsepower, 460 pound-feet of torque and max trailering capacity of 12,000 pounds, and considering all that power it's not terribly far away from the fuel economy of GM's equally new 4.3-liter V6 and its rating of 18 mpg city and 24 mpg highway. This announcement comes just days after a report indicated that GM is unable to keep up with the demand of the 5.3-liter V8 in the fullsize Chevy and GMC trucks due to supplier issues. GM's official press release for the 6.2-liter V8's fuel economy is posted below.

2018 GMC Sierra Denali 1500 Drivers' Notes | Chrome cowboy

No matter how much automakers want to charge for trucks, it seems there will be a market. Ford, Ram and GM all have trucks that can push well over $60,000, something that would sound unbelievable even 10 years ago. That brings us to the 2018 GMC Sierra Denali, GM's top dog in the pseudo-lux truck segment. It's packed with tons of goodies and features, but it's starting to feel a little long in the tooth. Still, GM trucks are some of the best selling vehicles in America, so it seems customers don't mind the age. Associate Editor Reese Counts: I've said it before, but I'm not a big truck guy. Give me a Colorado or Tacoma over any of the full-sized behemoths rolling off assembly lines today. Still, I do enjoy taking one home on occasion, especially one as comfortable and well appointed as this Sierra Denali. There's leather and wood and contrasted stitching throughout. The problem is that it's all a veneer over what's becoming an extremely dated truck, though a new one is on the horizon. There's one big thing that truly bothers me about this truck: no keyless entry or ignition. Don't get me wrong, I have no problem doing things the old-fashioned way, but when literally every other competitor at this price has keyless as standard equipment, the fact that GMC (and Chevy for that matter) still require you to pull out a fob and stick a key into an ignition is really glaring. It has to have something to do with the platform, as GM makes plenty of vehicles that don't require a key. One thing that doesn't feel dated is the ride and performance. This truck is equipped with GM's Magnetic Ride Control, and it works wonders for the Sierra's comfort. It would be even better if it wasn't wearing some gaudy 22-inch wheels, but it's still better than a lot of trucks out there. The powertrain, too, is a nice bright spot. The eight-speed automatic is smooth and never feels lost in the hunt for better fuel economy. The 6.2-liter V8 feels strong, and power comes on smooth and easy. Ford's EcoBoosts may win on fuel economy, but there's nothing like a big, burly V8. Senior Editor, Green, John Beltz Snyder: Despite the massive amounts of guilt I feel every time I put my foot to the accelerator, big trucks — something of which I used to steer well clear — are beginning to warm up on me. That being said, others have made more of an impression on me than this Sierra.