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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).

The Scaldarsi Emperor I is a Mercedes-Maybach S600 taken to 11 on the bad-taste scale

The custom car world is filled with vehicles designed by people that don't know when to quit. The Scaldarsi Emperor I, shown here in all its awful rose-gold glory, appears to have been designed by an enthusiast of the KFC Double Down. It's a hideous creation and we can't let it pass without saying so. We also can't look away. Scaldarsi's so-called "artists" have thoroughly reworked what was a perfectly wonderful Mercedes-Maybach S600. In addition to the 24-karat rose gold accents, the company has crafted a new front fascia and modified the side and rear treatments. Inside, the general S600 shape remains, but new leather and wood cover nearly every surface. Your insane imagination will not be tamed, as there are 24 colors for the leather, 24 types of animal hides, 78 types of wood, and 16 exterior body colors available. The result, at least in the publicity shots, is a mix of awkward textures and seats that look like a pile of colorful marshmallows. Those interested in purchasing an Emperor I can option custom-engraved champagne glasses, matching tote bags, and even an Emperor Edition Rolex watch. If the standard key fob is too common for your taste, they'll make you one custom. Watch out for that Scaldarsi logo, though – it looks mean enough to rip through your pocket and take a chunk out of your leg. We will give Scaldarsi credit for wisely letting Brabus handle the power. The Emperor I uses the 6.3-liter twin-turbocharged V12 from the Brabus Rocket 900. This 888-horsepower monster is a tuned version of the V12 AMG uses in the S65, SL65, and G65. The Emperor I has an estimated 0-60 mph time of just 3.7 seconds, which is quick enough to leave stoplights before anyone recognizes you behind the wheel. Scaldarsi is asking a mere $1.5 million for each of 10 examples being created. If you miss out on the Emperor I or are some kind of twisted completist that needs one of each, this just the first in a series of customs the company will offer. Next up is the Emperor II (a Mercedes-AMG S65 Coupe), which will be followed by the Emperor III (Bentley Bentayga), Emperor IV (Mercedes-AMG G65), and Emperor V (Bugatti Chiron). Lord help us all. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Recharge Wrap-up: Houston's bus revival, autonomous trucks on the Autobahn

A documentary shows how Houston, Texas significantly improved its outdated bus system. Called High Frequency: Why Houston is Back on the Bus, the short film describes how the city reimagined its bus system to become more efficient, more useful and more popular. Despite some opposition, the change has proven to be effective, with bus ridership up eight percent in three months, and light rail ridership up due to complementary bus routes. See the video above, and read more at CityLab. Automakers sent autonomous semi trucks on the German Autobahn as part of the European Truck Platooning Challenge of 2016. Mercedes-Benz, Volvo and Scania, among other groups, sent platoons of trucks between Stuttgart, Germany, and Rotterdam, Holland. In Mercedes's platoon of three trucks, the lead truck was fitted with lasers and other sensors to guide the convoy down the road. The two following trucks relied on vehicle-to-vehicle communication to trail 50 feet behind the lead, making room for cars to come between them and closing the gaps when able. The close following distance provides fuel economy gains of up to 10 percent in the rearward trucks on account of the reduction in drag. Read more at Hybrid Cars. Renault has reduced NOx emissions in its Euro 6b diesel vehicles in real world driving conditions. By improving its exhaust gas recirculation systems and NOx traps, nitrogen oxide emissions are cut in half on average, under certain driving conditions. The improvements will be included in vehicles leaving the factory beginning in July of 2016. Beginning in October, owners of Renault Euro 6b diesels can have the modifications added to their cars for free. Read more from Renault. Tata Technologies is creating an innovation lab in California to partner with EV technology companies. Having a tech center in California allows Tata to work on technologies that will largely be deployed in the company's main market of Asia. "Today, we are partnering with companies and startups who have aspirations to sell in China, but a lot of what they do is in California," says Samir Yajnik of Tata Technologies. Read more from The Economic Times. BMW's i Ventures is investing in mobility-as-a-service software provider RideCell. RideCell provides technology for services such as carsharing, ridesharing and other transit services. "The convergence of transportation trends in cities is of key importance to BMW," says Ulrich Quay, head of BMW i Ventures.