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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).

Mercedes S-Class Cabrio caught nearly naked

The new Mercedes-Benz S-Class is a handsome car, and its new two-door variant is positively dashing. Considering that, did you really think Mercedes would shake things up when it finally came time to drop the top on its flagship luxury model? Nope, neither did we. This is the S-Class Cabriolet, and from the beltline down, it's basically the same fixed-roof car we tested back in October – same grille, same headlights, same twin character lines in the profile. This is not a bad thing. We're betting it'll wear very similar taillights to the S-Class Coupe, although it's difficult to tell on the more heavily camo'd example of the luxurious droptop. Differences, meanwhile, are kept to the absolute minimum. The windshield looks more aggressively raked, and the inclusion of a canvas roof has softened the Coupe's svelte profile, but other than that, there aren't many changes at all. Expect the S-Class Sedan and Coupe's engine lineup to inform the powertrain strategy for the Cabriolet, meaning a base S550 with a 4.7-liter, twin-turbocharged V8. It's unclear if AMG variants will be offered, although we wouldn't bet against it. Our spies report that the S-Class Cabrio will saunter into dealers later this year, eager to steal the lunch money of the aging BMW 6 Series Convertible. We're betting on a European auto show debut, so keep an eye open at the upcoming Geneva Motor Show. If not there, Frankfurt seems like a likely destination for the new droptop.

2015 Mercedes-Benz S65 AMG Coupe

For Mercedes-Benz to truly demonstrate the capabilities and sensations of the S65 AMG Coupe, it needs to commission the building of a highway halfway to the moon. That's right, a ribbon of Autobahn roughly 120,000 miles long, with 50,000 miles of twisties and sweepers. Let's even add some loop-de-loops though the ionosphere, since, you know, we're going all the way with this. We've been following the headlines about progress on a new lunar lander and the SpaceX Mars Colonial Transporter, but we recently discovered that we've already got both of them in the S65 AMG Coupe. This isn't a car, it's a rocket ship. And it's not perfect, but it is spectacular. Starting with the way it looks. When Mercedes unveiled the concept at the 2013 Frankfurt Motor Show, I wasn't impressed. In fact, I told the Mercedes PR person, "It's fine, but the rear end doesn't do anything for me." And today? I'll have the crow, please, with lots of ketchup. When the test car you see here arrived, my loins tumbled and my knees developed a slight tremble. By the following week I was posing thought experiments like, "What's hotter: me in this car, or nothing else ever?" It's big – just eight inches shorter than the S-Class sedan and only an inch narrower. It's an inch longer than the Porsche Panamera and four inches wider, but just 0.3-inches taller than that slinking sport sedan. Its size and segment seem to have freed the designers' pens, and we think it's the best and most unapologetic expression of the brand's current language. We'd normally vote "nay" to a face full of chrome, but the coupe has the width to spread the polished elements around, and the top-to-bottom three-dimensionality indeed earns the adjective "jewel-like." A button on the center console lifts the entire car to protect those jewels when needed. The profile doesn't give up on the rising, sculpted wedge we've known for years – the one we used to love on the SL-Class. And again, the 16.6-foot expanse of sheet metal gives those opposing swage lines an unhurried opportunity to carve the body. The sidelong swell is enhanced by the carbon-fiber rocker panel laid into the concavity along the bottom, as well as those hips over the rear wheels. Speaking of which, the polished, 20-inch forged rollers are spot on. The bluff backside is sculpted just enough to keep it interesting, from the decklid spoiler to the horizontals across the bumper and carbon diffuser. Mostly, though, it seems to say to anyone behind, "Please.