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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.

Cadillac reveals stretched ATS-L in China

In the market for a new Cadillac, but need more space than an ATS can afford? Then you'll want to look at the larger CTS. Unless you live in China, where buyers - often chauffeured instead of driving themselves - seem to prefer a long-wheelbase version of a smaller sedan than upgrading to a larger one. For those buyers, Cadillac has released the new ATS-L.
Based on the existing ATS sports sedan, the ATS-L offers an extra 3.3 inches of rear legroom over the model we get here. As a result, the ATS-L stretches its wheelbase to 112.5 inches and its overall length to 186 inches, while riding a quarter-inch lower than the standard-wheelbase model, which itself was recently updated. That places its length in between the regular ATS and the CTS available Stateside.
Otherwise it's essentially the same sedan, but appears to ditch the base 2.0-liter four to offer either the 2.0-liter turbo four or 3.6-liter V6. Of course this model, produced locally for the Chinese market, isn't likely to make the transpacific voyage to US showrooms, so American buyers will still have to choose between the standard ATS, the larger CTS or the even larger XTS.