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Watch this week's Top Gear America used-car challenge

Top Gear America is back for the penultimate episode of the first season. Used car challenges were some of the highlights of the original UK edition. In our exclusive clip, Tom Ford, Antron Brown and William Fichtner run their $7,000 sports cars in a drag race. As expected, the trio chose very different cars for the challenge. Watch the video to see if a Subaru WRX's all-wheel drive can overcome a power deficit to beat a Ford Mustang and a Chevy Corvette. Brown and Fichtner also spend some time relaxing with an old Jeep Wagoneer. Like them, we're really hoping Jeep will bring back the Wagoneer nameplate. Brown also drives a Maserati Levante, proving that not all family cars need be boring. This week's guest star is actor, rapper and former host of Pimp My Ride, Xzibit. Top Gear America airs Sundays at 8 p.m. Eastern on BBC America. Related Video: Celebrities TV/Movies Chevrolet Ford Subaru Top Gear exclusive top gear america

Now you can 3D print your favorite new Ford

Ford is letting people build their own cars, offering digital files so people can print 3D versions of their favorite models. This is way cooler than any old Matchbox or Hot Wheels toy. Ford this week started offering printable files for the F-150 Raptor, Shelby GT350R, Focus ST and Fiesta ST. Folks can order the 3D models in 1:32 scale in plastic (that'd make the mighty large pickup truck about eight inches long) but the digital files let users tweak the scale to the their liking. Once people have the digital files, they can print out their own miniature versions of the cars, made out of soft plastics, sandstone, and even some metals. Ford says it expects demand for such files to grow as sales numbers for desktop 3D printers surges to 1 million units in 2018. That's up from about 44,000 last year. Ford already offers digital files for its company logo, the 1.0-liter engine block, and two older Mustang models. But these new models take this to a totally different scale. Check out Ford's press release below. PRINT YOUR FAVORITE FORD VEHICLE AT HOME: FORD FIRST AUTOMAKER TO OPEN ONE-STOP 3D SHOP ONLINE - Consumers can now download digital images and 3D-printable files of Ford vehicles at the first-ever automaker-licensed, one-stop 3D shop online - The Ford 3D Store offers printable files of F-150 Raptor, Shelby GT350R, Focus ST and Fiesta ST; more models will become available later - Online store is powered by TurboSquid.com, the leader in providing automotive digital imaging and 3D-printable files Want to 3D-print a Shelby GT350R at home? Or would you prefer to simply purchase an F-150 Raptor 3D digital image for a presentation? How about both? Ford fans can now download digital images for Ford vehicles at the first-ever, automaker-authorized one-stop online store for 3D-printable vehicle files. The Ford 3D Store, 3d.ford.com, allows customers to use advanced technology to make their own models of Ford vehicles of the size and material they desire, or simply opt to purchase a 3D digital file from a growing library of more than 1,000 Ford images. "3D printing at home is a growing trend, and it makes sense for us to offer our customers a chance to make their own 3D Ford models," said Mark Bentley, licensing manager, Ford Global Brand Licensing.

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.