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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.

2014 Cadillac ELR wears a suave suit with Volt underpants

The Cadillac design and engineering teams were smiling like a bunch of proud papas here in Detroit this morning, as the Wreath and Crest crew pulled the curtain back on their 2014 ELR. The house was packed for the ELR's coming out party, and reaction was enthusiastic amongst the murmuring media, as far as we could gather, while the flashes were firing.
In fact, we think that the sleek styling and aggressive proportions of the Voltec-powered ELR looked even better in the metal than they did in the first official images we saw earlier. Further, the leather-lined interior seems custom made for serious driving, even if the ELR is slightly less than rocket-ship quick.
The new Cadillac makes good use of the basic running gear from the Chevrolet Volt, including the 1.4-liter range-extending gas engine, a 15.6-kWh lithium-ion battery pack, and an electric drive motor that offers 295 pound-feet of torque, and a total system output of 207 horsepower. All-electric range is down by just one mile versus its Chevrolet forebearer, for a total of 35, and Cadillac speculates that the total range with the gasoline generator figured in will top 300 miles.