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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.

Weekly Recap: Toyota propels hydrogen fuel cells

Toyota is serious about hydrogen fuel cells, and it wants the auto industry to follow suit. The Japanese automaker said this week it's releasing 5,680 fuel cell patents from around the world, including technologies used on its upcoming sedan, the 2016 Mirai. The move is unusual, but not unprecedented, as Tesla similarly released its electric vehicle patents last year. The idea for Tesla, and now for Toyota, is to spur development of alternative propulsion. "By eliminating traditional corporate boundaries, we can speed the development of new technologies and move into the future of mobility more quickly, effectively and economically," said Bob Carter, Toyota Motor Sales senior vice president of automotive operations, in a statement. Toyota's fuel cell patents will be free to use through 2020, though patents related to producing and selling hydrogen will remain open forever. Toyota said it would like companies that use its patents to share their own hydrogen patents, but won't require it. "What Toyota's doing is really a logical move, and really a good move for the industry," Devin Lindsay, principal powertrain analyst with IHS Automotive, told Autoblog. The announcement was made at the Consumer Electronics Show in Las Vegas. It comes as Toyota prepares to launch the hydrogen-powered Mirai in a limited number late this year in California. The launch will be extended to the Northeastern United States next year. Toyota also has announced plans to support networks of fueling stations in each region to try to smooth consumer adoption. The Mirai has a 300-mile range on a tank of hydrogen, and it takes about five minutes to refill. Fuel cells have been receiving increased attention recently, and Audi and Volkswagen debuted hydrogen-powered cars at the 2014 Los Angeles Auto Show. Honda, another proponent of the technology, also showed its updated FCV concept in November in Japan. The company, however, has delayed its fuel cell sedan a year until 2016. Like Toyota, Honda says its hydrogen-powered car will have a range of 300 miles or more. Meanwhile, Hyundai currently offers leases for fuel-cell powered Tucsons, which have a 265-mile range, in Southern California. Despite the optimism some automakers have for fuel cells, the technology still faces barriers. A lack of filling stations has long held it back, and many consumers are not familiar with the potential benefits.

Top Gear season 25 opens with a V8 roadtrip through America

Great news for fans of BBC Top Gear: the first episode of season 25 is here. Viewers of BBC America will catch the season opener on March 3, and for the American audience this episode is definitely suitable watching. The episode has been dedicated to V8 sportscars almost in its entirety, as it's been wrapped around a Western roadtrip with a motorsport bias. The three hosts get to choose three V8 sports cars, with the basic idea of finding the best all-rounder. Matt LeBlanc goes for a Hennessey-tuned GT350R, Rory Reid chooses a Jaguar F-Type SVR, and Chris Harris shakes up the pack by selecting a McLaren 570GT. It's a nicely varied trio, with V8 power still showing what it's good for. There are various challenges along the way, just like there should be on a Top Gear roadtrip episode – even if the road surface itself isn't always ideal. But things smoothen out, all the way to a NASCAR oval and an airport runway; the flooded Bonneville salt flats aren't suitable for shenanigans, so substitutes have to be found. The trio also hit dirt roads, and have to evade a buggy-driving Ken Block during a "moonshine run to the border." Fans of Sabine Schmitz will be pleased to find her piloting a chain car racer, which consists of two American junk cars with a Honda CRX chained in the middle. It must make sense to someone. The Star In A Reasonably Priced Car segment has been retained for this season. This time it's the British actor Rob Brydon driving the Toyota GT86, on a very wet lap around the show's Dunsfold Aerodrome track that must be a cult classic by now. All in all, the season 25 opener is exactly what it says on the tin. There's nothing out of the ordinary, but it still has excellent cinematography, V8 roar and some nice landscapes. Classic Top Gear. Cowboy duels, Sabine Schmitz chain car racing, @RobBrydon, a @kblock43 car chase and #TheStig The latest episode of #TopGear is available on @BBCiPlayer now. Outside the UK? See local listings here: https://t.co/HPPhbUErDu pic.twitter.com/87F53C8oYb — Top Gear (@BBC_TopGear) February 26, 2018 Related Video: