1957 Ford Fairlane 500 4.8l on 2040-cars

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Which is more fuel efficient, driving with a pickup's tailgate up or down?

Thanks to the smoke wand in the wind tunnel, you can actually see the difference in our video.
Should you drive with your pickup truck's tailgate up or down? It's an age-old controversy that's divided drivers for decades. Traditionalists will swear you should leave the tailgate down. Makes sense, right? It would seem to let the air flow more cleanly over the body and through the bed. But there's also a school of thought that argues trucks are designed to look and operate in a specific manner, and modern design techniques can help channel the airflow properly. So don't mess with all of that: Leave the tailgate up.

Ford Shelby GT350 Mustang to cost $52,995?

The 2015 Ford Shelby GT350 Mustang was one of the shining stars of this year's Los Angeles Auto Show. And the Blue Oval's latest muscle car might even have reason to burn a little brighter if a recent rumor about its price proves true. Best of all are rumors that an even more potent version of the Shelby is potentially on the way. According to Horsepower Kings citing unnamed Ford sources at the LA Auto Show, the 2015 GT350 carries a starting price of $52,995, and the Tech package adds a further $2,995 on top of that. There's also the claim of a Track package for an undisclosed price. However, it doesn't look like LA is the last we'll see of the newest Shelby because the source also alleges that a top-rung GT350R is under development with bigger brakes, modified aerodynamics and sportier tires. This rubber-burner is reported to be unveiled at the North American International Auto Show in Detroit in January. Assuming these claims are correct, it puts the Shelby in fighting form against its two Chevrolet Camaro rivals. Ford reports that the GT350's 5.2-liter V8 pumps out over 500 horsepower and more than 400 pound-feet of torque. At $52,995, it would undercut by a couple of grand the $55,505 (before destination) base price of the 580-hp 2015 ZL1. The super 'Stang might also beat the 505-hp Z/28 with its power rating, while being vastly cheaper than the track-focused Camaro's $72,305 price. This could be quite the performance shoot-out.

The next-generation wearable will be your car

This year's CES has had a heavy emphasis on the class of device known as the "wearable" – think about the Apple Watch, or Fitbit, if that's helpful. These devices usually piggyback off of a smartphone's hardware or some other data connection and utilize various onboard sensors and feedback devices to interact with the wearer. In the case of the Fitbit, it's health tracking through sensors that monitor your pulse and movement; for the Apple Watch and similar devices, it's all that and some more. Manufacturers seem to be developing a consensus that vehicles should be taking on some of a wearable's functionality. As evidenced by Volvo's newly announced tie-up with the Microsoft Band 2 fitness tracking wearable, car manufacturers are starting to explore how wearable devices will help drivers. The On Call app brings voice commands, spoken into the Band 2, into the mix. It'll allow you to pass an address from your smartphone's agenda right to your Volvo's nav system, or to preheat your car. Eventually, Volvo would like your car to learn things about your routines, and communicate back to you – or even, improvise to help you wake up earlier to avoid that traffic that might make you late. Do you need to buy a device, like the $249 Band 2, and always wear it to have these sorts of interactions with your car? Despite the emphasis on wearables, CES 2016 has also given us a glimmer of a vehicle future that cuts out the wearable middleman entirely. Take Audi's new Fit Driver project. The goal is to reduce driver stress levels, prevent driver fatigue, and provide a relaxing interior environment by adjusting cabin elements like seat massage, climate control, and even the interior lighting. While it focuses on a wearable device to monitor heart rate and skin temperature, the Audi itself will use on-board sensors to examine driving style and breathing rate as well as external conditions – the weather, traffic, that sort of thing. Could the seats measure skin temperature? Could the seatbelt measure heart rate? Seems like Audi might not need the wearable at all – the car's already doing most of the work. Whether there's a device on a driver's wrist or not, manufacturers seem to be developing a consensus that vehicles should be taking on some of a wearable's functionality.