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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.

40+ cars that barely avoid the gas guzzler tax

The Gas Guzzler schedule, with mpg ratings and charges that haven't changed since 1991, lays out which fuel-swillers owe what to Uncle Sam.
I started thinking about the "Gas Guzzler Tax" - considerably less well known as The Energy Tax Act of 1978 - when I was driving Dodge's new Challenger SRT Hellcat last week. Unsurprisingly for a car that can burn 1.5 gallons of gas per minute at max tilt, theoretically able to empty a full tank of premium in about 13 minutes, the Hellcat will be subject to the Gas Guzzler Tax schedule when it goes on sale.

2015 Cadillac ATS Coupe configurator is ready to get personal

If you are in the market for a luxury coupe but would prefer it to be American, then you are in luck because the configurator for the 2015 Cadillac ATS Coupe is now online.
Prices for the Cadillac start at $38,990 (including the $995 destination fee) for the 2.0-liter turbocharged four-cylinder with 272 horsepower and 295 pound-feet of torque, or $46,145 for the 321-hp, 275-lb-ft 3.6-liter V6. Gearbox options include a six-speed manual on some 2.0 models or a six-speed automatic on both of them, and they can be ordered with all-wheel drive for $2,450 to the four-cylinder or $2,600 to the 3.6.
One thing that Cadillac does especially well here is giving customers a plethora of models and options to choose from. Trim level choices include standard, luxury, performance and premium for the four-cylinder or luxury, performance and premium for the V6. There are also 10 colors available, five of which carry an extra premium of $495 or $995. Upgraded interior packages for $1,295 add improved trim and leather, as well.