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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.

Best sport sedans for 2022 and 2023

SUVs dominate the car industry at every size and price level, but some people still prefer the looks, and more importantly, the performance and comfort, of the traditional sedan. With a lower ride height, lighter weight and generally smaller size, they often are much more fun to drive, and can even be more comfortable. Sport sedans of course lean harder on the performance side of things, and are among the best options for sheer speed and fun, thanks to those inherent characteristics. We've rounded up the ones in the segment that do the sporty dance better than any others in 2024 to give you a handy guide when you're shopping for one of your own. You'll find a wide array of cars here including gas, electric and hybrid powertrains. They'll have manual and automatic transmissions and drive the front, rear or all four wheels. Technically a few hatchbacks have slipped in, but they're close enough in look and feel that we wanted to include them. And excluding them means you might miss out on some of the best-driving options available. You wouldn't want that, would you? Alfa Romeo Giulia Why it stands out: Punchy four-cylinder; astounding power from Quadrifoglio; light and nimble character; awesome shift paddlesCould be better: Clunky infotainment; sub-par switchgear Read our Alfa Romeo Giulia review We start this list with one of the most predictable inclusions: the Alfa Romeo Giulia. Yes, it's a stereotype that the Italian sport sedan is fun to drive, but the fact is, well, it is. The Giulia comes standard with a turbocharged 2.0-liter four-cylinder making 280 horsepower, making it one of the most powerful four-cylinders in the segment. It's paired with a snappy and smooth eight-speed transmission and either rear-wheel or all-wheel drive.  The engine is lively and torquey, if a little short of revs, and the chassis feels super-light. The steering is eager and the car jumps into corners. We also highly recommend getting a version with the enormous and superb aluminum paddle shifters that make clicking through gears much more entertaining. And on the topic of the interior, it's attractive, but the various switches and knobs feels a little cheap, and the infotainment system is clunky. Of course there's also the incredible Giulia Quadrifoglio at the high end. It gets a Ferrari-derived twin-turbo 2.9-liter V6 making 505 hp, and it's rear-wheel drive only.

2021 Cadillac Escalade will get next-gen Super Cruise with auto lane-change

Super Cruise is getting its first big update since it was originally launched on the 2018 CT6 sedan. As that large car fades away, this new version of Super Cruise will be coming online in the 2021 CT5, CT4 and … the 2021 Escalade! Yes, ladies and gents, Cadillac is finally applying its advanced driver assistant to the iconic Escalade. The biggest change to this version of Super Cruise is a new feature called “Lane Change on Demand.” When Super Cruise is engaged, the driver can tap the turn stalk, and the car will execute a hands-free lane change if itÂ’s safe to do so. This kind of lane-change functionality is similar to that offered by other manufacturers' systems (i.e. Mercedes-Benz, Tesla, BMW). However, like the rest of Super Cruise, the car is able to complete the task with the driverÂ’s hands completely off the steering wheel so long as the driver monitor can tell that youÂ’re paying attention. Further improvements abound. “This is our most extensive update weÂ’ve made to Super Cruise since its debut,” said Mario Maiorana, Super Cruise chief engineer. “We have made a number of improvements to make Super Cruise more intuitive, better performing and more accessible for our customers. In addition to the automated lane change functionality, weÂ’ve made improvements to the user interface and hands-free driving dynamics.” Cadillac says that it has gathered richer map information to make the lane change function possible and also to make turns and highway interchanges smoother. The software was also improved with the aim of gaining “better steering and speed control.” Cadillac also made the system easier to engage. It did this by allowing the operator to switch the Super Cruise system on, and then get the vehicle in a proper lane position — it automatically activates once the vehicle is positioned. Previously, the driver had to get the vehicle centered in the lane properly, and then you were allowed to switch the system on. The auto lane changing function operates similarly to other systems like it. When driving, you can either tap or fully depress the turn signal stalk. The car then looks for an acceptable opening in the indicated lane. Once found, the car begins its lane change. Within the gauge cluster, there are animations that keep the driver apprised of the lane change at all times. Once the vehicle has moved into the new lane, itÂ’ll shut the turn signal off and continue driving along.