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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.

2015 Ford Focus

Sitting down at the pre-drive briefing with Ford engineers ahead of sampling the refreshed 2015 Focus, water bottles clinked as we wet our whistles before Q&A. While pouring a glass, we noticed something stamped on the bottle label: "1L." One liter. We were palming the exact displacement of the EcoBoost engine our group was about to drive. This was undoubtedly coincidence (such bottles litter every conference and dinner table in Europe) but it served to drive home just how small the total swept volume of Ford's wunderkind powerplant really is. It's tiny.
Of course, this isn't our first run-in with the little triple - we've sampled its turbocharged charms before in Ford's smaller Fiesta. At that time, we found it had plenty of poke for the subcompact, but the larger C-segment Focus carries around another 450 pounds or so and pushes a wider profile through the air. Would the three-cylinder have the stuffing to make the most of the Focus' athletic chassis, or would it be a letdown? Would it be the same as it was when we tested it in a Euro-spec Focus a couple of years ago? There was nothing left for it but to head out on the bucolic roads surrounding Versailles the day after the Paris Motor Show and find out for ourselves.

Nuclear-powered concept cars from the Atomic Age

In the 1950s and early 60s, the dawn of nuclear power was supposed to lead to a limitless consumer culture, a world of flying cars and autonomous kitchens all powered by clean energy. In Europe, it offered the then-limping continent a cheap, inexhaustible supply of power after years of rationing and infrastructure damage brought on by two World Wars.
The development of nuclear-powered submarines and ships during the 1940s and 50s led car designers to begin conceptualizing atomic vehicles. Fueled by a consistent reaction, these cars would theoretically produce no harmful byproducts and rarely need to refuel. Combining these vehicles with the new interstate system presented amazing potential for American mobility.
But the fantasy soon faded. There were just too many problems with the realities of nuclear power. For starters, the powerplant would be too small to attain a reaction unless the car contained weapons-grade atomic materials. Doing so would mean every fender-bender could result in a minor nuclear holocaust. Additionally, many of the designers assumed a lightweight shielding material or even forcefields would eventually be invented (they still haven't) to protect passengers from harmful radiation. Analyses of the atomic car concept at the time determined that a 50-ton lead barrier would be necessary to prevent exposure.