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The new 679-hp McLaren 688HS leaks online

McLaren, since returning to the road car business a few years back, has refused to let up. Every year the company has released a new model or a new variation of a previous one, and they've all been pretty damn good. Now that the limited production P1 and 675LT are all sold out, the company has been working on a fast new track-focused model to replace it. Thanks to a user on the forum McLaren Life, we now have our first glimpse of the upcoming 688HS, F1-inspired roof scoop and all. The 688 High Sport was commissioned by McLaren Special Operations, the group that builds small-batch bespoke vehicles like the 650S Le Mans or the 650S Can-Am. Carscoops reports the new car will be limited to just 25 models, making it one of the most exclusive road cars on the planet. Like the 675LT, the 688HS will be a faster and leaner version of already fantastic 650S. The number 688 refers to the 3.8-liter twin-turbocharged V8's output in metric horsepower, or about 679 in American ponies. It is set to lose weight over the 650S and will be fitted with a number of carbon fiber aero modifications. The photos show a large scoop on the roof and out back two uprights for what appears to be a fixed rear wing. Expect a zero to 60 mph time of less than three seconds and a price tag of more than $350,000, although all 25 models are presumably spoken for. Those itching for a rare car from MSO can hold their breaths for the rumored F1 successor. Related Video: News Source: CarscoopsImage Credit: McLaren Life McLaren Coupe Special and Limited Editions Supercars mclaren 650s

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).

1997 McLaren F1 GT Longtail extends itself to Geneva

McLaren arrived in Geneva this year with not one, but two new variants of its superlative supercars: the track-bound P1 GTR and the new 675LT. But lest you forget that the latter is not the first long-tailed model to roll out of Woking, it also brought along an example of the original. The long-tailed McLaren F1 GT – and no, we're not missing an R at the end – was developed as a homologation special so that McLaren could field similarly extended F1 GTRs on the racing circuit. Only three examples were ever made: 54F1GT currently resides in Brunei. 58F1GT lives in Japan. But the final one – bearing the designation 56XPGT – was kept by the factory. That's the one you're looking at here, resplendent in dark metallic green and making a rare appearance at the 2015 Geneva Motor Show. Related Video: Featured Gallery 1997 McLaren F1 GT Longtail: Geneva 2015 View 22 Photos Related Gallery 2015 Geneva Motor Show Videos View 25 Photos Image Credit: Live photos copyright 2015 Drew Phillips / AOL Geneva Motor Show McLaren Coupe Supercars Classics 2015 Geneva Motor Show