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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).

Recharge Wrap-up: Porsche adds third 919 Hybrid for Le Mans, Audi to heat factory with geothermal

Porsche will be running a third 919 Hybrid LMP1 car in the 2015 24 Hours of Le Mans endurance race. The extra Porsche will race in the six-hour May 2 WEC race at Spa-Francorchamps as a lead-up to the legendary 24-hour race on June 13 and 14. Porsche hasn't announced the driver lineup for the third 919 Hybrid, but drivers will remain the same for the other two cars. Including the third car is meant to help further test performance and efficiency as part of development for future hybrid systems. Read more at Green Car Congress. BMW i Ventures is investing in Zendrive, a driving focused data and analytics company. The cooperation of the two companies is meant to help advance safety and efficiency by making the "in-car mobility experience even smoother by optimizing commuting and driving patterns," according to BMW i's Ulrich Quay. The venture capital arm of BMW's i brand also invests in JustPark, Chargepoint, Life360, Chargemaster and MyCityWay, and says it will have more strategic investment announcements in the coming months. Read more in the press release below. The Audi Hungaria factory in Gyor, Hungary will soon be getting geothermal energy from a nearby plant being constructed in Per. When the facility is finished, Audi expects to source 82,000 megawatt hours of geothermal energy per year from it, or about six percent of its total heating needs. The clean energy helps Audi move "step by step along a path to developing a CO2-neutral production plant," says Audi's Dr. Hubert Waltl. "The mobility of the future must be CO2-neutral – and that applies not only to the use of our vehicles, but also to their production." Read more in the press release below. Supporters have begun a petition drive for the passage of an E15 ordinance in Chicago. Despite pushback from oil companies, the city council is close to passing the "Chicago Clean Air Choice Ordinance," which includes the requirement by retailers to sell the 15-percent ethanol gasoline blend in the city. The ordinance includes an exception for stations selling less than 850,000 gallons of fuel per year. More than 4,000 people have signed the petition so far, with others leaving messages to voice their opinion on the matter in opposition to Big Oil's attempt to block it. Read more at Domestic Fuel. BMW i Ventures announces strategic investment in Zendrive. - Further Increasing safety and security through innovative mobility services. New York City, NY.

Porsche 911 GT3 RS looks wicked, this way comes

Those who didn't think Porsche went extreme enough with the latest 911 GT3 likely won't be disappointed when the more focused GT3 RS arrives. And as you can see from these latest spy shots, it looks like it's speeding right around the corner. Tipped to debut at the Geneva Motor Show this coming March, the new Porsche 911 GT3 RS is shaping up to be an enthusiast's dream - and with the prospect of a GT2 in doubt, could be the most hardcore Elfen in the range. Instead of the 3.8-liter flat-six in the current GT3, the new RS will pick up where the previous limited-edition GT3 RS 4.0 left off, with four naturally aspirated liters of unadulterated boxer power channeling a good 520 horses to the rear wheels. That will be a significant increase over the existing 475-hp GT3 and will match the 911 Turbo for output (if not the 560-hp Turbo S) and without any turbo lag to slow down the action, either. Whether it will keep the GT3's dual-clutch gearbox and four-wheel steering system, or ditch one or both for a more analog approach, remains to be seen, but we're holding out hope. Either way, the modifications to the bodywork ought to make the GT3 RS stand out even further and stay glued to the race track it will call home. Notice the deep front splitter scooping up snowflakes like a shovel, a massive rear wing (which may or may not be the final production version), the Turbo-spec rear end with air intakes ahead of the rear wheels, and a set of awesome-looking gills over the front wheels – all of which you can scope out in the gallery full of spy shots above.