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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).

Rolls-Royce Wraith and Dawn order books closed globally

Rolls-Royce closed order books for the Wraith coupe and Dawn convertible at the end of last year in the U.S. Brand chief Torsten Muller-Otvos told Autocar that both have since been removed from every market. Final orders are still being produced at the Goodwood factory, so the last Wraith and Dawn won't likely leave the line until early next year. But with the taps turned off and nothing to replace them yet, Rolls-Royce will soon be two-thirds of the way done with what has been a very successful chapter in its history. Those two offerings, as well as the Ghost sedan, are based on the architecture BMW created for the 2008 7 Series. Now only the Ghost remains of the trio, at this point planned for production until 2030 when Rolls-Royce will convert being to an electric-only automaker. More modern products like the Phantom II sedan and the Cullinan crossover ride on the company's Architecture of Luxury. That structure will also support the Spectre battery-electric coupe meant to go on sale at the end of 2023. Spectre spy shots reveal a body that looks much like the Wraith; however, Autocar says, "Rolls instead views the Spectre as a belated successor to the coupe version of the seventh-generation Rolls-Royce Phantom, with the pair sharing a similar footprint and the Spectre therefore having its own distinct positioning within the Rolls range." The erstwhile Phantom Coupe's length and wheelbase were about 20 inches longer than those of a Wraith. The Phantom II sedan is but a couple of inches longer than the previous two-door. Point being, the Spectre might be silent, but it won't be small. There will still be some BMW in it, however, like Rolls-Royce's version of the stacked headlights BMW is about to debut on the i7 and X7, and there's speculation the top-dog BMW iX M60i powertrain will cross the Channel to enter Goodwood's service. Peak output for the BMW reaches 610 horsepower and 811 pound-feet of torque, which sound like fine numbers for wafting.

Recharge Wrap-up: Google Street View maps gas leaks, Rolls-Royce helps kids build electric racer

Google Street View is looking for gas leaks. Natural gas leaks are not only extremely dangerous, they're a terrible waste of resources and, as a greenhouse gas, a threat to the environment. Unfortunately, with the decaying infrastructure in many of America's older cities, they're pretty common, too. That's why Google is teaming up with the Environmental Defense Fund to map gas leaks. With sensors attached to the Street View cars, they are sniffing out methane leaks and documenting them. So far, they've covered Boston, Staten Island and Indianapolis, with Los Angeles and Syracuse up next. Read more over at Gizmodo. Consumer and environmental groups are calling on the Federal Trade Commission to change the way car advertisements disclose fuel economy. Nine groups, including Sierra Club, Union of Concerned Scientists and Consumers Union, want mpg figures to be clearer and more complete. They have requested that when mpg is advertised, that it includes the EPA's city, highway and combined ratings. They also, among other requests, want mile-per-gallon-equivalent ratings for electric cars to state that they are for comparative purposes only, and to include separate gas and electric ratings for plug-ins and range extended EVs. See what else the groups have requested at Kicking Tires. Rolls-Royce has a new electric car, and it's not the 102EX. The luxury automaker worked with a group of elementary school students in the UK to build an electric car for the IET Formula Goblin project, where students build and race their own electric "car." Rolls-Royce lent the 9, 10 and 11 year-olds a bit of engineering and manufacturing assistance to build the car, which they then raced at the Goodwood Motor Circuit. Read more at World Car Fans, or check out the press release, below. ROLLS-ROYCE SUPPORTS LOCAL PRIMARY SCHOOL'S RACING DEBUT A team of school children mentored and supported by Rolls-Royce Motor Cars successfully completed the Greenpower IET Formula Goblin race at the Goodwood Motor Circuit on Sunday. The group of 10 boys and girls from Years 5 and 6 built and piloted a specially developed electric car in a race against teams from schools across the UK. 'Team March', from the March CE Primary School adjacent to the Home of Rolls-Royce in Goodwood, finished well up the order and scooped the prize for 'Best Bodywork'.