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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.

2017 Cadillac CT6 Plug-in Hybrid is the most efficient and torquey CT6 of all

Cadillac is returning to the hybrid game after discontinuing the ill-fated ELR, this time with an existing car and a new drivetrain. The company has taken its CT6 flagship and given it a turbocharged 2.0-liter four-cylinder, a pair of motors, and a big battery pack. The result of this combination is a CT6 that manages a rating of 65 MPGe, can go 30 miles on a full electric charge or 400 miles combined with the engine. The powertrain produces 335 horsepower and 432 lb-ft of torque. That's the same amount of power as the 3.6-liter V6 CT6, and more torque than that engine or the twin-turbo 3.0-liter V6. Cadillac claims the CT6 plug-in is capable of hitting 60 miles per hour in 5.2 seconds and reaching a top speed of 150 mph. The green and grunty CT6 plug-in will be available this coming spring, and it will have a premium price of $76,090. Cadillac says that its equipment list is comparable to the CT6 Premium Luxury trim level, which starts at $64,590 with the 3.6-liter V6, and $68,590 with the twin-turbo V6. However, in addition to the hybrid powertrain, Cadillac throws in a number of features that are options on the conventional gasoline models. To get the hybrid's rear seat infotainment system and enhanced night vision, a buyer would have to add $5,800 in option packages. That still leaves the twin-turbo model $1,700 shy of the hybrid, but that's not a terrible trade for the option of fuel-free driving for at least some of the time. Related Video: Featured Gallery 2017 Cadillac CT6 Plug-in Hybrid View 15 Photos Image Credit: Cadillac Green LA Auto Show Cadillac Hybrid Luxury Sedan cadillac ct6 2016 LA Auto Show

Cadillac ATS Crimson Sport Edition is here for a limited run

The Cadillac ATS has been a well-received entry into the small sport sedan segment for General Motors' premium brand, but keeping the model fresh is an understandably high priority. A two-door coupe variant is on the way and should help keep interest up, but the line's volume leader is still expected to be the sedan. In order to keep awareness high and sales going, GM will need to lavish a little attention on its four-door, as well. That's where the Crimson Sport Edition comes in.
Crimson Red Metallic paint is the exterior highlight for this special-edition Cadillac, while the interior is complemented with a number of microsuede touchpoints, including the heated steering wheel and shifter. To this point, the car's rich burgundy finish has only been offered on CTS-V Coupe and Sport Wagon models, and brand spokesperson Donny Nordlicht tells Autoblog that this is the first time that the company has offered a microsuede wheel with heat. Four interior trims are also available, although all have been seen previously.
The Crimson Sport will be limited to production this spring, and the trimmings can be added to either the 2.0T Performance or the V6 Premium specifications. Both rear- and all-wheel drive will be available, as well. Prices start at $46,010 for the turbocharged model and $51,010 for the V6 including destination fees, which represents a premium of $2,990 for the extra equipment.