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How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

2018 Cadillac XT7 three-row crossover spied [UPDATE]

UPDATE: Upon further consideration, and after speaking to some industry insiders, it appears this might not actually be a new Cadillac, but instead just a mule of the new Chevy Traverse. One source points out that the foglights are fixed, round units, which would be production spec and would not suggest Cadillac. Another source says the Cadillac version of the Traverse/Acadia/Enclave was cancelled, and development has stopped. Yes, a Cadillac of this size is expected to arrive – and elements of this prototype sure do look Cadillac to us – but it might be too early for this to be it. Cadillac is expanding its portfolio with a three-row crossover. This is it. Expected to be called the XT7, the new vehicle will give Cadillac an entry above the XT5 and below the hulking Escalade. Though the XT7 is heavily covered, we can see Cadillac's (?) bold grille and what looks like strong proportions. It'll probably look like a larger XT5, and you can sort of (maybe) see a similar roofline if you squint. Spy shooters caught it testing with the new Chevy Traverse and Buick Enclave, and they're all expected to use the new General Motors 3.6-liter V6 engine, like the recently revealed GMC Acadia. The XT7 could show up as soon as late this year or early in 2017. Its part of GM's push to capitalize on the red-hot crossover segment that has been fueled by low gas prices and Americans' thirst for utility. The XT7 would likely represent GM's most profitable play in this segment. Simply affixing the Cadillac badge on the front adds thousands of dollars to the sticker compared to a Chevy or Buick product. The XT7 will also give Cadillac a significant opportunity for growth – and perhaps allow it to gain on Mercedes and BMW on the sales charts. While the CTS and ATS have had mixed success, Americans have continued to show a willingness to buy Cadillac utility vehicles. The XT7 is the latest in Cadillac's product blitz following the XT5 and the CT6 range-topping sedan. Those two are the most critical Caddys, but the XT7 isn't far off. Related Video: Featured Gallery 2018 Cadillac XT7 View 11 Photos Image Credit: Brian Williams / SpiedBilde Spy Photos Cadillac SUV

Cadillac's semi-autonomous Super Cruise pushed back to 2017

It looks like General Motors is discovering just how difficult it is to bring autonomous vehicle technology fit for public consumption to market. The company has pushed back the launch of its semi-autonomous Super Cruise technology by several months. Originally promised by CEO Mary Barra for a fall 2016 debut, Super Cruise was supposed to be offered first on the new CT6 sedan. Automotive News is reporting that won't be the case, following a statement from GM confirming that the new system would be pushed to sometime in 2017. At the very least, that's a several month delay. GM cited the need to get the system right and keep owners safe, which prevented a firm date for Super Cruise's debut. Product boss Mark Reuss was more blunt, though, telling AN, "It will come out when it is ready." Super Cruise would be one of the earliest examples of driverless tech to be put into public hands, following the introduction of Tesla's semi-autonomous AutoPilot system in 2015. Most other automakers experimenting with the autonomous vehicles don't foresee public sales until early in the next decade, including Toyota, Renault-Nissan, and Volvo. Before Barra suggested a 2016 debut, GM originally aimed to introduce its semi-autonomous system in 2020. Related Video: