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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.

Cadillac CT5 Luggage Test | How big is the trunk?

The Cadillac CT5 is a midsize luxury sedan. At least by today's standards. By the standards of Cadillac's past, it's practically a compact. At 193.8 inches long, the CT5 is 3 inches shorter than its STS predecessor of 15 years ago and 11 inches shorter than the Seville of 25 years ago. This is significant since virtually every other car brand's offerings have grown from generation-to-generation. See the BMW 5 Series as just one example. You'd have to go back to the 1980s to find a CT5 ancestor that's smaller, though that stubby thing was an aberration.   Honestly, I'm just sharing that because I think it's interesting. This post is about trunk space, and exterior size doesn't necessarily equate to how much junk you can fit in the trunk. In fact, the CT5 is pretty good example of that. Although smaller than its predecessors, the CT5 is still an awfully big car that's comparable to other midsize luxury sedans, including the 5 Series, Audi A6 and Mercedes-Benz E-Class. The trunk, however, is notably smaller than what you'd get in those with a rather rinky-dink 11.9 cubic feet. That's coupe territory and less than what you'd get in some subcompact sedans. The A6 and E-Class are in the 13-cube range, while the 5 Series apparently has 14.5 cubic feet.  So, how small is 11.9 cubic feet? Although plenty wide at the rear, which should be handy for golf clubs, the CT5's trunk isn't very long compared to all those competitors. The A6's is narrower but also practically a tunnel by comparison. Also, note the ramp-like structures along the outer edges. Besides making loading a hassle, they effectively make the trunk even smaller than the 11.4 cubic-feet that's technically there since it's so difficult to load items right up to the wheel wells. You can see a closer look at those "ramps" above left along with the smallish pass through that oddly looks like a previous-generation Hyundai Sonata's grille.  Above right you can see the underfloor storage. There is no spare tire.  Besides those "ramps" impeding luggage loading from below, these giant speakers hanging down from the parcel shelf sure don't help, either. Watch your hands while loading, as well as anything that might be easily scratched (or that might damage the speakers) OK, let's get to the bags.

Cadillac to ditch China-only LWB models for global 'right size'

We often think of Buick being General Motors' poster child in China, but would it surprise you to hear that Cadillac is just doing a bang-up job in the People's Republic? It's true, the Standard of the World is on fire, and it's doing so with a surprising group of buyers that are going to push through globe-spanning changes for the brand. Cadillac's average buyer age in the People's Republic of China is just 34. Yes, younger buyers dominate the Chinese market, but according to Reuters, Cadillac's young buyers want to drive and they don't want the typical businessman's German-badged sedan. Cadillac understands this, and is setting about to exploit it with a shift in its Chinese strategy. According to President Johan de Nysschen, the company will begin moving away from the China-only, long-wheelbase models, like the ATS-L. Instead, it will push for a global "right size" design, along with some stylistic changes. "You will see a softening of some of the hard edges, and more three-dimension styling on the side of the car," de Nysschen told Reuters, while noting that the cars will still be "instantly recognizable as Cadillac." Even without these changes, though, Cadillac has bucked the trend in China. At 17 percent, the company's sales exceeded the PRC's overall market growth of 7.3 percent by a significant margin. In fact, Cadillac's 2015 gains outpaced the overall market growth in China over the past three years, as the brand jumped to nearly 80,000 units. And the company is hoping to push that even higher, Reuters reports, with President Johan de Nysschen targeting a 25-percent increase in 2016. Related Video: