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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 shows dealers convertible rendering

Cadillac is getting serious about revitalizing and expanding its lineup, and to that end, a new report claims that brand boss Johan de Nysschen has been showing plans for several new models to the marque's dealer body - among them, a new convertible.
The droptop which Cadillac reportedly showed its dealers in sketch form, would be based on the same platform as the ATS and CTS, those it's unclear to which (if either) of those model lines the new convertible would be added, or whether the design features a canvas or folding hardtop roof. One way or another, it would be the first time Cadillac would offer a convertible since the Corvette-based XLR roadster was discontinued more than five years ago.
Quoting an unnamed brand spokesperson, Cadillac would "like to introduce an open car to the portfolio at some point," however, "it's not likely to be one of the near-term portfolio additions."

General Motors posts record earnings, but global sales fall

General Motors started the year with record success. The automaker's $2.7 billion in adjusted earnings before interest and taxes was its highest ever in in the first quarter of 2016, up from $2.1 billion in from the same time period a year earlier. Net income grew to $1.95 billion, which was more than double the $953 million in the same period last year. The company's figures also beat analysts' predictions, according to the Detroit Free Press. Despite the financial growth, global sales actually decreased by 2.5 percent to 2.36 million vehicles. "We're growing where it counts, gaining retail share in the US, outpacing the industry in Europe and capitalizing on robust growth in SUV and luxury segments in China," CEO Mary Barra said in the company's financial announcement. GM did well in North America with an adjusted EBIT of $2.3 billion, up from $2.2 billion last year. Sales in the region also grew 1.2 percent to 800,000 vehicles. According to The Detroit Free Press, the company has been especially successful at selling more expensive models in the US. The company's average vehicle was $34,600 in Q1, about $3,000 more than the industry average. Elsewhere in the world, GM also showed improvement. Europe practically broke even after losing about $200 million last year, and Opel and Vauxhall sales grew 8.4 percent to more than 300,000 vehicles for the quarter. South America only lost $100 million, which was half as much as Q1 2015's $200 million loss. China remained flat at $500 million of income. Cadillac volume jumped 6.1 percent there, and Buick's deliveries increased 22 percent, thanks to the Envision crossover's success. GM Reports First-Quarter Net Income of $2.0 Billion 2016-04-21 EPS diluted of $1.24; First-quarter record EPS diluted-adjusted of $1.26 First-quarter record EBIT-adjusted of $2.7 billion GM Europe posts break-even performance DETROIT – General Motors Co. (NYSE: GM) today announced first-quarter net income to common stockholders of $2.0 billion or $1.24 per diluted share, compared to $0.9 billion or $0.56 per diluted share a year ago. Earnings per share diluted-adjusted for special items was a first-quarter record at $1.26, up 47 percent compared to the first quarter of 2015. The company set first-quarter records for earnings and margin, with earnings before interest and tax (EBIT) adjusted of $2.7 billion and EBIT-adjusted margin of 7.1 percent.