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Ford dissects the heart of the 2015 Mustang, its engine range

Happy Mustang Day. Are you tired of hearing about the 2015 Ford Mustang yet? No? Good, here's a bunch of mechanical data on Ford's sixth-gen muscle car, along with cutaways of the GT's 5.0-liter V8 and the new 2.3-liter, EcoBoost four-cylinder shown above. We also have a smattering of info on the Stang's updated transmissions and an exploded-parts-diagram view of its all-new independent rear suspension.
Ford is set to make waves offering the Mustang with a turbo for the firs time since the small-volume SVO of the 1980s. Displacing 2.3 liters, the engine's twin-scroll turbo should help the four-cylinder turn out a projected 305 horsepower and 300 pound-feet of torque, while also returning the best fuel economy in the Mustang's engine lineup. As we said in our Deep Dive, the EcoBoost will be slotted in as a premium engine, above the 3.7-liter V6 but below the 5.0-liter V8.
Speaking of that high-revving eight-cylinder, it's receiving a new cylinder head with high-flow ports. The intake and exhaust valves are larger and the cams have been replaced, among other tweaks. It should rev even higher thanks to a rebalanced crankshaft and forged connecting rods. Ford is still claiming a projected 420 hp and 390 lb-ft, although as many of the changes for the 2015's V8 come from the 2013 Boss 302, we're going to assume there's some sandbagging at work.

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.

Are you Ford's next Bullitt Mustang? [w/poll]

Ford has a long history of offering special editions of its legendary Mustang. One of the most vaunted of those trim packages, though, has only been offered twice. The first time was in 2001, and then again in 2008. Yes, we're talking about the Bullitt.
Named for the infamous Dark Highland Green Mustang Fastback driven by Steve McQueen in the 1968 cop melodrama Bullitt, the car was famous for not just its pilot, but the high-speed chase it took part in during the movie. Now, we think we have images of the next Bullitt.
According to our spy photographers, the paint is a "dead-ringer" for the Dark Highland Green that has signified these special edition Mustangs. While we're inclined to agree, it's also worth pointing out that this shade looks very similar to one of the 2015's other new colors, Guard. We've yet to see one on the road (let alone in such dreary conditions), so it's tough to say for certain.