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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 EcoBoost V6 hits the dyno before hitting the track

Ford Racing just unveiled the Riley Daytona Prototype that will make its racing in the United SportsCar Racing Championship Rolex 24 at Daytona in January, and now it has released a video showing development of twin-turbo 3.5-liter EcoBoost V6 that powers the car. Using the same block and heads that can be found on a production Ford Taurus SHO, this new racecar benefits from the collaboration between Ford Racing and Ford powertrain engineers.
While we still don't know what kind of power this engine is putting out, it has definitely gotten a workout at Ford's 17G dyno. This area deep within Ford allows the automaker's racing program to work hand-in-hand with production engine programs, which can be a benefit to racing operations and production cars alike. Scroll down to hear a few people from Ford talk about the crosspollination between its racing and engine teams and watch the EcoBoost get red hot on the dyno.

Ford trademarking 'Mach 1,' possibly for Mustang

A legendary name might be accompanying the redesigned, 2015 Mustang when it finally makes its world debut - Mach 1. Stumbled upon by the team at Ford Authority, the Mach 1 title was found in a trademark filing with the US Patent and Trademark Office, and would revive a name last used on the fourth-generation, 2003 Mustang.
While the the 2003 vintage was well and good, the Mach 1 is really remembered for a three-year run from 1969 to 1971 - it's best to just forget the emissions-choked 1972 to 1978 Mach 1s - when power output ranged from a modest 250 horsepower with the two-barrel, 351-cubic-inch Windsor V8 to "375 hp" (actual output was rumored to be well north of 400 horsepower) with the righteous, 429-cubic-inch Super Cobra Jet V8.
What does the title hold for the sixth-generation Mustang? It's tough to say. The fanatics at Ford Authority seem to think Mach 1 could take the place of the Shelby GT500 at the top of the Mustang hierarchy, which sounds like a valid argument. At the same time, we could see the SVT Cobra moniker returning for the flagship model, and the Mach 1 doing battle with the Chevrolet Camaro Z/28 (unless the Boss 302 were to return). Confounding things is the historical precedent - the Mach 1 was responsible for the death of the Mustang GT in 1969, so it might make sense as a volume performance model.