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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.

President Trump's new limo spotted testing at high speed

What you're looking at is no ordinary limo. Look past the swirly camouflage and you'll see what appears to be a Cadillac, but don't let those looks fool you. This is the new Beast, otherwise known as Cadillac One, and codenamed by the Secret Service as Stagecoach. This is the car that will shuttle President Trump to and fro. It's hard to get a sense of scale from these images, but this car is huge. It's very likely built atop a heavy-duty truck platform, which is necessary due to the thick armor-like bodywork that's hermetically sealed to keep POTUS safe and sound. It's hard to tell for certain, but it appears this Beastie is riding on Goodyear Regional RHS II tires, which would otherwise be used on trucks and buses. Translation: this thing is heavy. The Beast is ostensibly badged as a Cadillac, and it wears the latest version of Caddy's corporate grille, badge, and upright headlamps at the front. From the rear, there's a hint of Rolls-Royce Phantom, with rear glass that tapers elegantly into the deck lid. In between is a massive slab-sided passenger compartment that's rumored to seat as many as seven passengers. These shots were snapped at GM's Milford Proving Grounds. It seems The Beast is undergoing some high-speed tests, though high-speed here is relative. Those Goodyears are only rated for 70 miles per hour or so, and we doubt the big 8.1-liter gasoline-fueled V8 engine is geared to push the President much faster than that, anyway. Related Video:

2018 Cadillac CT6 Drivers' Notes | Super Cruiser

The 2018 Cadillac CT6 showcases General Motors' impressive Super Cruise feature. It's the next milestone on the way to an autonomous future, though GM is being conservative about promoting Super Cruise's considerable prowess. It helps the driver, GM says. Does it work? Our editors have been testing one this week as the calendar turns and the temperatures drop in Michigan. Also, the CT6 is a really nice car. Here's what we think. Senior Editor, Green, John Beltz Snyder: Super Cruise, man. On Wednesday night, I rode home in a 2018 Cadillac CT6 with Super Cruise. I say "rode," but I was sitting in the driver's seat. I spent more time with my hands off the steering wheel than on it. It was super relaxing. Once I got on the highway, I set the cruise control, waited for the steering wheel icon to show up on the instrument cluster, and hit the button on the steering wheel that looked like a steering wheel (pretty meta, to be honest). The top section of the wheel illuminated in a green arc, and I felt the weight of the steering lift as the car began driving itself. I put my feet flat on the floor, rested my hands on my knees, and just watched the road while listening to a podcast ("The Dollop," if you were wondering). To be honest, I had trouble concentrating on the audio, as my thoughts were captivated by the way the car managed the road and traffic around me. Sure, I had to change lanes on my own and take over steering on interchanges and surface streets, but when the AI took the reins, it had my complete confidence. Perhaps just as surprising, the CT6 was also a blast to drive manually. It felt super smooth, with plenty of power and poise. I enjoyed bending it through 50-mph curves almost as much as I enjoyed being driven. Almost. Editor-in-Chief Greg Migliore: Super Cruise just works. I was blown away how easy it was to use and how well it just did what it was supposed to do. Merging into the teeth of rush hour traffic in metro Detroit, I braced for the worst. I figured I'd be stuck in bumper-to-bumper gridlock and Super Cruise would never get deployed. Frankly, I was cynical Super Cruise would work. But then I was able to hit the 70-mph speed limit and figured, well, let's just see about this thing. Like John, I did the two-steps to set up SC, and boom, it worked. It trailed the cars in front of me at a proper distance. It braked naturally to a stop and then resumed speed. It slowed down when a Jeep Grand Cherokee cut me off.