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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.

2015 Cadillac ATS Coupe prepares to fight BMW 4 Series

Cadillac introduced its new ATS Coupe at the 2014 Detroit Auto Show today, bringing customers an alternative to the growing range of sport luxury coupes typified by the BMW 4 Series, Audi A5 and Mercedes-Benz C-Class Coupe.
The ATS Coupe, as a slightly more premium offering, ditches the wheezy 2.5-liter engine found in the basic ATS Sedan, but retains the four-door's 2.0-liter, turbocharged four-cylinder and 3.6-liter V6. That four-pot turbo benefits from a fettling that has increased torque from 260 pound-feet to 295, although its peak is only available from 3,000 rpm to 4,600 rpm, unlike in the sedan, where peak twist arrives at just 1,700 rpm and sticks around until 5,500 rpm.
Power can be channeled to either the rear or all four wheels by the owner's choice of a Tremec six-speed manual or a six-speed automatic transmission. According to Cadillac, the new Coupe can get to 60 in 5.6 seconds when fitted with the 2.0-liter turbo.

GM claims it's first to sell million 30+ mpg vehicles

As we continue to put together all the data for the year-end edition of By The Numbers, General Motors has announced that it sold more than a million vehicles in the US last year that achieved at least 30 miles per gallon on the highway. More impressively, GM managed this feat using multiple strategies including small vehicle size, turbocharged engines and hybrid or plug-in technologies across four brands (Buick, Cadillac, Chevrolet and GMC) accounting for 13 separate models. This number will grow even more in 2013 thanks to cars like the all-electric Spark, the diesel Cruze, the range-extended Cadillac ELR and the Buick Encore compact CUV.
GM's small car sales were up 39 percent last year helping to attain this million-sales mark for 30-mpg models, and almost 40 percent of all GM sales consisted of cars with fuel-efficient I4 engines. In regards to more advanced means of improving fuel economy, GM says that it plans on having 500,000 vehicles with "some form of electrification" on the road by 2017.
Scroll down for the full list of GM's million 30+ mpg cars as well as an informative press release.