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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).

Watch a Cayenne Turbo S, Range Rover SVR, and Cherokee SRT drag race

We live in a weird world where high-performance SUVs could win a 60-mile-per-hour sprint against sports cars from just a few years ago. Here, Top Gear sets up a three-way drag race against the Porsche Cayenne Turbo S, Land Rover Range Rover Sport SVR, and Jeep Grand Cherokee SRT, and the results show just how quickly these high-riding models can cross the quarter mile. The Cherokee SRT is the patriotic choice among the three, but it's down on power in this fight. Meanwhile, the Range Rover's menacing growl sounds the best, and the Cayenne Turbo S has the most horsepower. You'll have to watch the video to see which SUV will win this battle. Related Video:

Porsche to reveal Cayman GT4 Clubsport racer in LA

Aspiring professionals and amateur gentleman racers alike will want to swing by the Porsche booth at the LA Auto Show this year. That's where the German automaker will be revealing its new entry-level racer. The Porsche Cayman GT4 Clubsport is nearly stock, but features some choice upgrades to cater its disposition toward the racetrack. Power comes from the same 3.8-liter flat-six as the road-going Cayman GT4 (shown above), producing the same 385 horsepower. It ditches the manual, however, for the faster-shifting DCT (which we expect will soon be offered on the showroom version as well), aided by a mechanical locking differential. It features the front suspension setup from the 911 GT3 Cup car and beefed-up steel brakes. It's also got a roll cage inside and a racing bucket with a six-point harness. All told, the whole package weighs 2,866 pounds – making it a good hundred pounds lighter than the street-legal model on which it's so closely based. Once homologation is complete, customers will be able to field it in series like the Pirelli World Challenge, Continental Tire Sports Car Challenge, and Pirelli GT3 Cup Trophy. Porsche has yet to release images, but we'll be sure to update this post as soon as they're available – so watch this space. New race car for motorsport newcomers Porsche develops Cayman GT4 Clubsport Stuttgart. Using the lightweight Cayman GT4 as the basis, Porsche Motorsport has developed a near-standard racing version. The Cayman GT4 Clubsport celebrates its world premiere at the Los Angeles Motor Show on 18 November. Sales of the 283 kW (385 hp) mid-engine racer for motorsport newcomers also start on this date. Just like its race-worthy production sibling, the Cayman GT4 Clubsport is powered by a 3.8-litre flat-six engine. The racing version features a Porsche double clutch transmission with shift paddles on the steering wheel and a mechanical rear-axle locking differential. The lightweight suspension strut front axle is taken from its big 911 GT3 Cup brother, which is campaigned in Porsche's 20 one-make championships around the world. The impressive racing brake system is fitted with steel brake discs all round measuring 380-millimetre in diameter. Tipping the scales at just 1,300 kilograms, the Cayman GT4 Clubsport, delivered ex-works with a welded-in safety cage, a racing bucket seat as well as a six-point harness, is truly lightweight.