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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 welcomes back Entourage favorite Ari Gold

With publicity for the long-awaited Entourage movie ramping up, we're finding that one of the stars of the film happens to be the handsome Cadillac Ciel Concept convertible. It makes a number of appearances in the trailers with Vince, E, Turtle, and Johnny Drama cruising about, despite the fact that it isn't actually a production vehicle. We guess it pays to be Aquaman and Enzo Ferrari. Supporting its tie-in with the flim, Cadillac has enlisted Jeremy Piven, famed for his roll as outrageous, obnoxious, abrasive, and amusing talent agent Ari Gold, to star alongside its droptop sedan. The pair are the focus of a four-minute featurette welcoming the actor's character back while expounding on the series-ending cliffhanger that basically made the movie a sure thing. Take a look at the spot, which was directed and written by Entourage creator Doug Ellin. And be sure to check out the brotastic HBO series when it makes the jump to the big screen on June 3.

1959 Cadillac Eldorado and more featured in latest 'Forza Horizon 4' car pack

It's that time again, time for another Forza Horizon 4 car pack. This one is a bit bittersweet, because while there are some great cars, it will also be the last one included with the Car Pass, which covered every downloadable car pack for a discounted price. So either we won't see many additional cars in the coming months, or we'll be paying extra for them. On a brighter note, the cars in this pack are cool, particularly the 1959 Cadillac Eldorado Biarritz convertible. Threading this aircraft carrier of a car through British streets should be highly entertaining. It's also stylish as all get-out. There are more appropriately sporty cars coming, too, including the 1994 Honda Prelude Si, 1994 Nissan Fairlady Z Version S Twin Turbo and the all-new TVR Griffith. Some reward cars being added come from the role-playing video game Final Fantasy XV. They're the Quartz Regalia Type F and Type D. The Type F is another big luxury convertible in the vein of the Cadillac, and the Type D is the monster truck version. The car pack is available now, and is free to owners of the $29.99 Car Pass. The individual car packs are available for $6.99 separately, and individual cars are even available for $2.99 a piece if you only want specific ones. Related Video: Image Credit: Turn10 Studios / Playground Games Toys/Games Cadillac Honda Nissan forza horizon 4