2008 Gmc Yukon Denali on 2040-cars

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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.

GM warning 800,000 owners that their cars may need oil changes more frequently than they say

The days of changing your engine oil every 3,000 miles are long gone thanks to most cars having automatic oil monitoring systems, but about 800,000 General Motors vehicles apparently have incorrect monitoring software that is leading to premature engine component wear. According to Autoweek, certain 2010-2012 Buick LaCrosse, Regal, Chevrolet Equinox and GMC Terrain models equipped with 2.4-liter four-cylinder engines could be going too long in between oil changes resulting in a higher-than-normal number of warranty claims for the engine's balance chain. The balance chain links the balance shaft to the crankshaft, and a worn one can produce higher noise levels.
As a fix, GM dealers will be reprogramming the software for the monitors in an effort to reduce the interval between oil changes, which varies based on driving habits and conditions. Through February 2015, the software update will be done at no cost to vehicle owners, but since this is not a recall, after that point, it will be up to the discretion of dealers as to whether or not they will charge for the service. What isn't immediately clear is whether GM plans on giving assistance to out-of-warranty customers who are experiencing engine issues from the worn chain.

2015 GMC Sierra Elevation Edition goes dark, looks good

Forget about the so-called sporty Chevrolet Silverado Rally Edition. If you want a General Motors pickup with some added style, this one looks like a more cohesive, well-done package to our eyes (though it's also not "sporty," despite GM using that term over and over again). It's called the GMC Sierra Elevation Edition, and it hits dealerships later this year.
For its more stylish truck, GMC has fitted the 2015 Sierra Double Cab with a body-colored grille surround, door handles, mirror caps, side moldings and bumpers. The truck also rides on black 20-inch aluminum wheels.
The Elevation Edition, which GMC contends qualifies as a sport truck, comes standard with the Sierra's 285-horsepower, 4.3-liter V6, though buyers can opt for the more powerful 5.3-liter V8 with 355 hp. Other standard goodies include OnStar with 4G LTE connectivity and Bluetooth, all housed in the 4.2-inch Intellilink color display.