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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.

Hot sales have Detroit automakers shortening summer shutdowns

Back in May, there was speculation that the Detroit Three automakers would maintain or perhaps even extend their traditional summer shutdowns, mostly due to a bitingly cold winter that saw below-freezing temperatures infiltrate the southernmost reaches of the US, putting a chill on auto sales. Now, though, the numbers are in, and thanks to some promising sales figures, it looks like some domestic line workers are going to be working clear through July, in some cases.
According to Automotive News, Ford has slashed its traditional two-week hiatus for factory workers in half at four of its plants, while both Chrysler and General Motors will keep factories running nonstop (two plants in Chrysler's case and a third of GM's factories).
This is, as we said, thanks to some positive numbers. Chief among those is the Seasonal Adjusted Annual Rate, which was at an eight-year high of 17 million units. Individual figures were less promising. GM, embroiled in its recall scandal, still saw a one-percent increase while Ford dropped six percent in year-over-year sales. Chrysler was the big winner, though, with a nine-percent jump in June.

Ford readying dozen+ Mustang models for SEMA

Ford is unsurprisingly bringing a herd of its new 2015 Mustang models to next month's SEMA show in Las Vegas. Over a dozen of them are arriving from top aftermarket outfits like Galpin Auto Sports, Steeda, Roush and others. The Blue Oval isn't just shining a spotlight on the V8 model, though. The new EcoBoost 2.3-liter version with 310 horsepower and 320 pound-feet of torque is also getting its time in the sun.
Among the shined-up ponies will be a showcar helping Galpin celebrate the Mustang's golden anniversary, with the car is covered in the precious metal. The black paint over the body has gold flecks in it, and the wheels, side sills, brake calipers and badges all match, as well. However, it takes more than something shiny to truly impress at SEMA, and Galpin's Mustang also packs a Whipple supercharger for the 5.0-liter V8, boosting the bottom line to 725 horsepower. Take that, Hellcat. There's even a window in the hood to look through, not unlike a Chevrolet Corvette ZR1. The coupe also wears new headlights with LED turn signals that activate in sequence, just like the taillights, and the interior features black-and-gold Recaro seats.
Also set for its SEMA debut is an MRT showcar that takes the EcoBoost Mustang for a gallop with its TKO treatment. The black and orange two-tone car has been designed to incorporate select road racing elements. Mechanical upgrades include 14-inch brake rotors with new ducts, a Vortech air-to-air intercooler and an Air Lift suspension. The Mustang also shows off the company's products for added style and performance including a hood with integrated heat extractors and a unique front splitter.