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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.

2015 Ford Mustang Convertible shown on Twitter [UPDATE w/video]

It hasn't yet been 12 hours since the hotly anticipated 2015 Ford Mustang has been let out into public view. After a series of evocative leaks over the course of the last days, we brought you a full deep dive of the sixth-generation pony car at the dawning of today. And yet, here we are rushing to bring you news of a new Mustang variant, already.
Be it part of a plan to keep the Mustang fervor at full boil, or a misunderstood email somewhere in the chain of command, Ford UK has unceremoniously tweeted a picture of the 2015 Ford Mustang Convertible. For a newly global Mustang, getting our first look at the droptop from the convertible-crazy British does make some amount of sense.
As for details, well, you're looking at them. Brandon Turkus reported yesterday that the Mustang 'vert would make use of a fully electric convertible mechanism, and that it would be of fabric construction rather than some kind of retractable hardtop. We see here that the fabric part is clearly true, and it does look as though Ford may still be employing the same kind of manually attached tonneau cover that exists right now. Of course, our view from this angle isn't great, and the particulars are still up in the air.

AMC Trans Am Javelin SST, an ultra-rare underdog, is up for auction

Among the rarest of the American muscle cars that went racing in the early Seventies — cars including the Camaro Z/28 and the Boss 302 Mustang — the 1970 AMC Trans Am Javelin SST may be the most hard to find, and among the most valuable. Only 100 units of this unique Javelin were produced, and one of them is up for auction at the Mecum event in Dallas on September 20. The Trans Am Javelin was fashioned in a patriotic livery of tricolor paint — red, white and blue — and arrived after the American Motors Corporation had decided in 1968 to compete in the Trans Am racing series against Ford and General Motors. The company's chief driver, Mark Donohue, would dominate the 1971 season, taking seven wins in his Javelin AMX and that yearÂ’s SCCA Trans-Am Championship. AMC took the trophy with 82 points, well ahead of Ford's 61, Chevrolet's 17 and Pontiac's paltry 7. The example listed for auction came equipped with a 390-cubic-inch V-8 engine with 325 horsepower at 5,000 rpm and 420 pound-feet of torque, power steering and brakes, dual exhaust, BorgWarner four-speed manual transmission and Hurst competition shifter. Its “ram induction system” sealed a chamber around the air filter so that cool air from the functional hood scoop would be funneled into the intake. This JavÂ’s factory price was $3,995 — a mere $32,000 or so in today's money, though it was expensive by the standards of the time. The 100 Trans Ams were among 19,714 Javelin units built in 1970, so they started out rare, and today the surviving examples are highly collectible, if and when they come up for sale. No bid estimate is available yet. Related Video: Motorsports Chevrolet Ford Pontiac Auctions Automotive History Racing Vehicles Classics