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GM issues stop-sale for 3 SUVs over incorrect MPG rating

This week, GM sent a memo to Chevy, GMC, and Buick dealers to tell them to stop selling three SUVS. The 2016 Chevy Traverse, the GMC Acadia, and the Buick Enclave all have EPA window stickers that show higher fuel economy ratings than the vehicles actually have. Unlike other recent – and very public – fuel economy ratings problems from VW and Mitsubishi, it doesn't seem like GM did anything wrong with the testing for these vehicles, it just misprinted the labels. New labels are being printed and should arrive at dealerships this weekend and early next week. After that, the SUVs will be able to be sold and delivered again. The official fuel economy rating for the three SUVs are all the same. The correct numbers for the all-wheel drive versions are 17 miles per gallon combined, 15 city, and 22 highway. The stickers say the SUVs get 17/24/19. The front-wheel driver models were also incorrectly labeled, and the total number of affected vehicles is 59,823. In the memo, GM said the problem was caused by an "inadvertent error," Automotive News says. GM is working with the EPA to solve the issue. We have asked GM for a comment on the mistake and will update this post if we hear back. Related Gallery 2013 GMC Acadia View 16 Photos News Source: Automotive News – sub. req. Government/Legal Green Buick Chevrolet GM GMC Fuel Efficiency mpg gmc acadia chevy traverse

The future's electric — but the present is peak gasoline. Burn some rubber! Do donuts!

I vividly remember the year 1993 as a teenager looking forward to getting my driver’s license, longingly staring into Pontiac dealerships at every opportunity for a chance to see the brand-new fourth-generation Firebird and Trans Am. Back then, 275 horsepower, courtesy of GMÂ’s LT1 5.7-liter V8 engine, was breathtaking. A few years later, when Ram Air induction systems freed up enough fresh air to boost power over 300 ponies, I figured we were right back where my fatherÂ’s generation left off when the seminal muscle car era ended around the year 1974. It couldn't get any better than that. I was wrong. Horsepower continued climbing, prices remained within reach of the average new-car buyer looking for cheap performance, and a whole new level of muscular magnitude continued widening eyes of automotive enthusiasts all across the United States. It was all ushered in by cheap gasoline prices. And as much as petrolheads bemoan the coming wave of electric vehicles, perhaps instead now would be a good time for critics to sit back and enjoy the current and likely final wave of internal combustion. Today, itÂ’s easier than ever to park an overpowered rear-wheel-drive super coupe or sedan in your driveway. Your nearest Chevy dealership will happily sell you a Camaro with as much as 650 horsepower. Not enough? Take a gander at the Ford showroom and youÂ’ll find a herd of Mustangs up to 760 ponies. Or if nothing but the most powerful will do, waltz on over to the truly combustion-obsessed sales team of a Dodge dealer and relish in the glory of a 797-hp Charger or 807-hp Challenger. Want some more luxury to go with your overgrown stable of horses? Try Cadillac, where you'll find a 668-horsepower CT5-V Blackwing. You could instead choose to wrap that huffin' and chuggin' V8 in an SUV. Or go really off the rails and buy a Ram TRX or Jeep Wrangler Rubicon 392 and hit the dunes after a quick stop at the drag strip. Go pump some gas. Burn a little rubber. Do donuts! There is nothing but your pocketbook keeping you from buying the V8-powered car of your dreams. Yes, just about every major automaker in the world has halted development of future internal combustion engines in favor of gaining expertise in batteries and electric motors. No, that doesnÂ’t mean that gasoline is going extinct. There are going to be gas stations dotting American cities and highways for the rest of our lifetimes.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).