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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.

2021 Cadillac Escalade's EPA highway fuel economy is worse than before

EPA fuel economy estimates for the 2021 Cadillac Escalade are out, and the news is mostly not good. The redesigned SUV sees slim to no improvement in the Feds' city ratings, and its highway numbers are considerably worse than before. These are estimates for the standard 6.2-liter V8. Figures for the no-cost-optional 3.0-liter turbodiesel six have not been released yet. Specifically, the rear-wheel-drive 2021 Escalade has estimates of 15 mpg city, 20 mpg highway, and 17 mpg combined. Compared to the outgoing 2020 version, powered by the same 6.2L V8, those numbers represent a 1 mpg improvement in city (the lone piece of good news) but are 3 mpg worse on the highway. With all-wheel drive, the 2021 Escalade can't even get out of the teens, with EPA ratings of 14 mpg city, 19 mpg highway, and 16 mpg combined. That's the same city rating as before and a 2 mpg decline versus the 2020 model's highway rating. For further comparison, cross-town rival Lincoln's Navigator with its 3.5-liter turbo V6 manages 16 mpg city and 22 mpg highway (RWD) and 16/21 with AWD. No one expects an ultra-large, body-on-frame, three-row SUV to achieve Prius-like levels of fuel efficiency, but it's pretty rare these days to see such backsliding with a fresh redesign. Here's hoping the diesel variant will have a happier story to tell. Related Video:

GM cancels CES date, possible Cadillac EV crossover unveiling

General Motors is bailing on CES 2020, the big annual consumer technology showcase in Las Vegas, after its plans to showcase an autonomous, electric vehicle were derailed by the 40-day UAW strike this fall. New evidence suggests that vehicle may have been Cadillac’s upcoming EV crossover. MotorTrend got GM to confirm that it was pulling out of CES, which takes place in January, though CEO Mary Barra in an interview said only that the vehicle they had planned to unveil was electric and featured autonomous technology — two key areas where the automaker plans to focus in the future. The automaker said the model simply wasnÂ’t ready. But MT said it then received an invitation from Cruise, GMÂ’s self-driving vehicle subsidiary, to an event later in January in San Francisco. That suggests the automaker could have been planning a different vehicle to show at CES than its self-driving Cruise AV “robotaxi,” which famously features no steering wheel or pedals. Cadillac showed off a digital rendering of a forthcoming unnamed electric crossover in Detroit in January, saying only that it would be available in both two- and all-wheel drive and sold globally. GM has said Cadillac will be its lead brand as GM delves into EV technology. The speculation is that the crossover will also feature CadillacÂ’s Super Cruise semi-autonomous highway driving technology. Whatever the vehicle was, or is, Barra said itÂ’ll be ready for viewing in the first half of 2020. GM has been developing the Chevrolet Bolt-based Cruise AV, a fully autonomous car, alongside its Cruise self-driving technology subsidiary, and building them at Orion Assembly plant near Detroit. It had once planned to debut a fleet of ride-hailing Cruise AV robot axis by the end of this year but realized the timeline was not realistic. Testing of the robot axis continues in San Francisco, Phoenix and Michigan. As for timing on a new timeline for fleets of Cruise AVs to take over the streets, Barra wouldnÂ’t show her hand. “We see a line of sight but weÂ’re not going to put another date out there,” she told MT, adding it was more important to “gain customer trust and usage.” As for Cadillac, any new reveal would likely come after the all-new Escalade SUV in February and amid a product blitz that will see it introduce a new or redesigned model roughly every six months through 2021.