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GM's MPG overstatement could affect 2 million vehicles

Late last week, GM admitted that three of its large SUVs fuel economy window stickers did not match their actual efficiency ratings, and so the vehicles couldn't be sold. The stickers on the 2016 Chevy Traverse, GMC Acadia, and Buick Enclave said their ratings were one to two miles per gallon better than they should have been. Officially, the number of affected vehicles sits at about 60,000. But Consumer Reports makes a good point: what's up with all of the previous model year SUVs that are basically the same vehicle? To wit: the 2016 model year vehicles are not substantially different than the 2015 or the 2014, or even going all the way back to 2007. On the EPA's fuel economy website, all of these older models will "have better stated fuel economy numbers than the new vehicles in GM's dealerships," Consumer Reports noted. CR's best point, and the one that makes the 60,000 number potentially grow to 2 million if all of the vehicles built on this platform are affected, is that "[i]t seems unlikely that the company would change the powertrain on these carryover models so late in their model cycles in a way that would cause a dramatic, negative impact on fuel economy." GM says that earlier model year SUVs are not affected and the EPA did not respond to CR's question about the potential for more discrepancies. We've seen automakers reverse course before, so if GM has to come out with a mea culpa soon, don't be surprised. GM is rushing corrected stickers to dealers so that the SUVs can be sold again, but a fix for the already-sold vehicles could be trickier to solve. Related Video: Related Gallery 2013 GMC Acadia View 16 Photos News Source: Consumer Reports Government/Legal Green Buick Chevrolet GMC Fuel Efficiency mpg gmc acadia chevy traverse

CA Chevy dealer allegedly adds $50K 'market value adjustment' to 2015 Z06

It seems to happen with every eagerly anticipated new car – dealerships, recognizing that crushing demand far outstrips the initial limited supply of a new model, inflate the price via a so-called "market value adjustment." We've seen it in the past with a number of new models, and now it's happening again with one of the Detroit 3's hottest vehicles. A dealership in Roseville, CA, outside of Sacramento, has allegedly attached a staggering $49,995 market value adjustment to a 2015 Corvette Z06. We say allegedly because, despite the evidence uncovered by BoostAddict, John L. Sullivan Chevy's online inventory listing doesn't display the price premium of the Z06 in question, a (normally) $93,965 model with the top-end 3LZ trim. It's unclear if either of the dealer's other Z06s, both 3LZs, one of which is in transit, will receive similar price adjustments. Now, legally, Sullivan Chevy isn't doing anything wrong here. Dealerships are under no obligation to observe a manufacturer's suggested retail price, a point General Motors' spokesperson Ryndee Carney pointed out to Autoblog via email. "For the Corvette Z06, Chevrolet has established a Manufacturer's Suggested Retail Price we feel is right for the market. Actual transaction prices, however, are the province of the dealer," Carney said, adding that a dealer zone manager will be discussing the price hike with the dealership. While we also reached out to the dealership over both the market value adjustment and the price of the Z06 as it appears on the company's website, we've yet to hear back as of this writing. Should they reply to our inquiries, we'll be sure to update you. Until then, we'd like to hear what you think about this case. Is Sullivan Chevy simply pricing the cars as high as it thinks the market can bear, or is this a cash grab for an hotly anticipated product? Have your say in Comments.

GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging