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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 F-100 'Snakebit' shown off by Gene Simmons and Shannon Tweed at SEMA

Ford, along with KISS bassist Gene Simmons and his wife, Shannon Tweed, used SEMA as a backdrop to pull the covers off Snakebit, a 1956 Ford F-100 pickup truck that's been updated with Shelby Mustang-derived styling bits and a 5.4-liter supercharged V8 engine. All 550 horsepower are funneled through a six-speed manual gearbox to the rear wheels.
Underneath the custom bodywork sits a chassis that's been stretched five inches and a bed widened and bedecked with billet machined pieces that are supposed to look like wood. The 20-inch rear and 18-inch front wheels ape those of past Shelby Mustang models. The interior is swathed in two-tone leather with a bench seat designed to look - try to act surprised - like a Shelby Mustang.
Like what you see? Bidding for the truck will take place in 2014 at an unspecified Barrett-Jackson event (we'd assume Scottsdale). Proceeds will be used to help build a children's hospital in Saskatoon, in the province of Saskatchewan, where Ms. Tweed grew up. See the high-res gallery above and the press release down below for more.

Hennessey Ford GT sets 267.6-MPH record at Texas Mile [w/videos]

The record-setting Hennessey-powered camouflage Ford GT we showed you at this time last year headed back to the Texas Mile and managed to bring home yet another record. As you may recollect, last year saw Mark Heidraker's machine sprint to a record 257.7 mph thanks to propulsion from its twin-turbo 5.7-liter V8. The big mill sucks down race gas, and this year the creation pulled off a 267.6-mph run over the weekend. That feat set a new record for the event. Something tells us neither Heidraker nor Hennessey are done squeezing more thrust from this machine.
This particular Ford GT has already gone through a number of permutations. Hennessey started by tweaking the factory supercharger set up before abandoning the blower in favor of two turbos. Since then, the crew has poked and prodded it to coerce as much grunt as possible out of the car. We expect Hennessey will probably come out with a video of the record-setting run shortly, but in the meantime, you can see a couple of videos of the car's runs in Texas below (one of which actually captures the record run). Enjoy.