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Watch new Jaguar XF perform a literal high-wire act

Coming out with a new luxury sedan can be a truly daunting prospect. Make it too edgy and you'll risk disenfranchising what can often be a rather conservative customer base. Make it too conservative and you may fail to attract enough new customers or generate enough interest to make the endeavor worthwhile. Whether Jaguar succeeded in walking that thin line with the new XF is a matter of personal taste, blending as it does elements from the smaller XE and the outgoing XF it replaces. But in launching the new model, Jaguar didn't just pull of a figurative high-wire act – it did quite a literal one. To drum up support for its newest debut, Jaguar undertook the stunt depicted in the video above, stringing a pair of carbon-fiber cables some 60 feet above the River Thames in London. With some guide wires and counterbalance weights to keep it all in check, and a motion-picture stunt crew orchestrating it all, the new XF drove over 780 feet from one bank of the river to the other, setting a new world record in the process. Instead of thinking too hard about the whys (seriously, though... why?) and hows, we suggest you just watch the video above. Related Video:

Bloodhound SSC makes its speed-ready debut in London

Bloodhound SSC, the 1,000-mph land speed record contender, broke cover this week in Canary Wharf, London, in the heart of the Docklands financial district. "This is the best of British engineering meets the best of British banking," quipped Philip Dunne, MP, minister of state for defense procurement, which has provided backing for the team in terms of Army and Royal Air Force personnel and equipment. The team announced that Bloodhound will do its first test runs in Newquay, Cornwall, next spring before traveling to Hakskeen Pan in northwest South Africa in the fall. There, on October 15, 2016, it will make its first attempt on the land speed record, which currently stands at 763.035 miles per hour. That speed was set by Thrust SSC in the Black Rock desert on October 15, 1997 by Bloodhound's driver, Andy Green. Nineteen years later to the day, Green will be shooting for a speed over 800 mph. Over 8,000 people will come to Canary Wharf to see this extraordinary jet- and rocket-powered car over the next couple of days. This is the first-ever viewing of the machine in assembled form. The right-hand side is fully dressed in desert spec, complete with forged aluminum wheels and aerodynamics. The left-hand side is in 'naked' Newquay test spec, with panels removed for easy access and the whole thing riding on rubber tires that can run on tarmac. First impressions are of a big yet muscular car simply crammed with engines, jets, and rockets. The most recognizable thing, apart from the seven fire extinguishers, is the Jaguar AJ133 5.0-liter V8, lifted from an F-Type, which will run the fuel pumps that deliver over 211 gallons of high-test peroxide over the rocket motor's 20-second burn time. The EJ200 Typhoon military jet engine occupies the top floor and provides nine tons of thrust, and underneath is the single Nammo rocket motor providing an additional four tons. "When we go for 1,000 mph, we'll need another two rocket motors," says Mark Chapman, Bloodhound's chief engineer. "That total additional eight tons of thrust is what we'll need to get from 800 to 1,000 mph." He explains that the rear of the car will have to be redesigned to accommodate the two additional rocket motors, and the suspension might have to be adapted with longitudinal rear spring units like the fronts. There are still unknowns in the project, such as the area of vacuum that will follow the car several meters behind.

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).