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Watch a Bentley Continental GT Speed hit 206 mph in Australia

The top speed listed on most cars is usually a rather theoretical affair. After all, where can you actually drive a car to its v-max, anyway? Well there are a few highways in the world – and really only a few – that will let you drive as fast as you can. One of them is in the Australian outback, so that's where Bentley took its new Continental GT Speed. The road in question is called the Stuart Highway. It's a 1,761-mile road which runs across the continent from Darwin in the north to Port Augusta in the south. That's about the same distance as driving from New York to Denver. Only unlike any of the highways you'd take to drive across America, the Stuart Highway has one long stretch of 120 miles between Alice Springs and Barrow Creek that is completely derestricted, and has been for the past two years since local authorities set about trying out removing the speed limit. To see how fast the new GT Speed could actually go in the real world, Bentley put Aussie touring car champion John Bowe behind the wheel and let 'er rip. The result is a top speed clocked at 206 miles per hour. That's pretty darn fast for any car, let alone one that weighs a massive 5,000 pounds. Its 6.0-liter twin-turbo W12 engine contributes significantly to that curb weight, but with 626 horsepower and 607 pound-feet of torque on tap, it also has the muscle to keep the Conti pulling like a freight train all the way up past the double-century mark. Watch it unfold in the video above. BENTLEY CONTINENTAL GT SPEED: VMAX IN THE OUTBACK - Continental GT Speed hits 206 mph (331 km/h) top speed on Stuart Highway, Australia - Northern Territory route one of only three derestricted roads in the world - Australian racing legend, John Bowe, takes Grand Tourer on extraordinary high-speed run - Continental GT Speed combines supercar performance with supreme luxury (Crewe, 04 November 2015) The 16MY Bentley Continental GT Speed has been taken to its top speed of 206 mph (331 km/h)* by Australian racing legend, John Bowe, on the derestricted Stuart Highway** deep in the Northern territory. The 635 PS (626 bhp), 820 Nm (607 lb.ft) W12-powered GT Speed Grand Tourer reached Vmax in just 76 seconds, covering a distance of 9.4 kilometres in the process. At top speed, the 6.0-litre twin-turbo Grand Tourer was covering a staggering 92 metres (or one football pitch) per second. John Bowe said: "This isn't a modified racecar; it's a luxurious grand touring road car fresh off the production line.

Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

A faster Bentley Bentayga Speed is coming

With 600 horsepower on tap, the Bentley Bentayga already claims the mantle as the fastest, most powerful SUV on the market. The latest reports indicate that there's an even faster, more powerful version in the works. After speaking with Bentley CEO Wolfgang Durheimer at the Beijing Motor Show this week, Auto Express reports that a Bentayga Speed is on the way. "If you're asking whether there would be Speed versions of the Bentayga eventually," said Durheimer, "then yes, you might expect that." Details, as you might have expected, remain unconfirmed at this point. However the latest Continental GT Speed packs 633 horsepower from its 6.0-liter twin-turbo W12 – 66 horses more than the standard twelve-cylinder Continental GT. And the Mulsanne's 6.75-liter twin-turbo V8 produces 505 hp in standard trim and 530 in Speed spec for a difference of 25 hp. If the Bentayga Speed follows a similar formula, we can expect a solid 650 hp or so. That ought to help push the SUV past 60 in less than its current 4.0 seconds, and on past its stated 187-mph top speed. The Speed version isn't the only variant of the Bentayga said to be in the works. We're also anticipating a diesel version as well as a hybrid. We wouldn't be surprised to see a lighter V8 model, too, as we have on the Continental. And a fastback model in the mold of the BMW X6 and company is also reportedly under consideration. Beyond the Bentayga, Bentley is said to be closely evaluating what to develop next. The choice is between the EXP 10 Speed 6 sports coupe concept on the one hand, and a smaller crossover on the other. The answer could depend heavily on how the Bentayga performs in the Chinese market. Related Video: