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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 releases updated 2015 CTS

Cadillac is in the process of applying the new wreathless emblem across its range one model at a time, but rather than simply slap the new logo on the existing models, it's taking the opportunity to roll out some revisions as well. First came the ATS coupe, followed by the updated ATS sedan, and now the flagship brand in the General Motors portfolio has quietly announced some revisions for the CTS sedan as well.
For the 2015 model year, the CTS - which was just introduced last year - gets a revised front end with that wreathless crest but also a new chrome grille with active aero elements on standard models and a black-chrome grille on the Vsport. The revised grille is flanked by new headlights, but behind them the engine lineup carries over: a 2.0-liter turbo four with 272 horsepower, a 3.6-liter V6 with 321 hp or - in the Vsport performance model - a 3.6-liter twin-turbo V6 with 420 hp that's still the most powerful V6 GM has ever made. All engines are mated to an eight-speed automatic transmission (ditching the six-speed auto on previous versions) and (apart from the RWD Vsport) can be had in rear- or all-wheel-drive flavors.
Cadillac has also given the updated CTS some new electronics (including inductive smartphone charging, onboard wifi, and more advanced parking and lane assist systems) as well as new wheels, trims and color options, details on which you can read in the press release below.

Book by Cadillac subscription service returns next year

Cadillac rolled out its subscription service Book by Cadillac at the beginning of 2017. On December 1, 2018, the automaker put the service on hiatus after having made a few revisions and learned a lot of lessons. Just a month later, brand president Steve Carlisle told GM Authority at this year's Detroit Auto Show that Book was definitely returning. A week after that, GM chief financial officer Deborah Wahl said Book 2.0 could be ready as soon as Q2 this year. It's taken a touch longer than expected to sort out the kinks, but Automotive News reports Wahl told an audience at the J.D. Power/NADA AutoConference L.A. that the real return happens in the first quarter of 2020.  When Book went on hiatus last year, the service charged $1,800 per month for insurance, maintenance, unlimited miles, the ability to swap into any Cadillac at will, and concierge-like vehicle delivery to your location with amenities like bottled water, umbrellas, and detailing. Good things came of it for the brand, such as the 70% of subscribers who'd never owned a Cadillac. Yet the drawbacks were too much. At one point, the carmaker said Book's halt was due to technical issues like "snags with the back-end technology used to support the service" that hampered customer service and increased costs. Cadillac managed the Book's fleet, as opposed to the dealers, and consumer choice — or a lack of it — played a role in the hiatus. In Carlisle's comments to GMA, he said that subscribers didn't swap out vehicles nearly as much as expected. Even though everything up to the full-fat V-Series models was in the catalogue, Carlisle said of the customers, "They wanted an XT5." The devotion to that one product changed the economics. "Are [subscribers] going to stay in that service if thatÂ’s what they realize they want?" he asked. "It is inherent in that model that we maintain more than one car per customer. And you got to think through the economic implications of that. Particularly if utilization is a lot lower than we thought because people are switching less than we thought." Wahl didn't offer any specifics on how Book 2.0 will differ from Book 1.0, only saying that there will be more "convenience, flexibility and value for potential subscribers." There will be less focus on swapping cars, and Cadillac will "base it off the dealer network." Since the brand's 900 U.S. dealers have the inventory, anyway, that should help both parties.