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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).

Elon Musk talks Tesla Model S updates, AWD version, Model X deliveries

Tesla Motors CEO Elon Musk does things differently than the heads of other car manufacturers. Case in point, he just made a quick European tour with stops in the Netherlands, Germany and Norway where he, along with CTO JB Straubel, held lengthy question and answer sessions with Tesla owners, reservation holders and other interested parties. Now, we recognize that the California company has a significantly smaller customer base than traditional automakers, making these sorts of events more logistically easy (see also: Fisker). Still, the effort is a refreshing change from scripted press conferences, and allows Tesloids to voice their concerns and criticisms to the exact person with whom the buck stops. It's also good for Tesla, in that it gives new ideas for future improvements a chance to reach the ears of those best placed to implement them. We out here in the wider world like these sessions because they give us a bit of extra insight into the firm's progress and future plans. So what are some of the things we can expect from the electric automaker in the coming months and years? Version 6.0 software is a few weeks away and includes real-time traffic information as well as increased suspension functionality, like lowering and heightening on command. Supercharger production is maxed out and installs are happening at a rate of around five per week. Superchargers will soon pump power at an impressive 135 kW rate, but will plateau there. An AWD Model S will be coming, perhaps around same time as the Model X. Bigger battery pack options may arrive as soon as next year. The new giga-factory for batteries could bring costs down by at least 30 percent, ideally 40 percent and will produce about 30 gigawatt-hours worth per year. After ramp up, volume production of Model X is expected to begin around April 2015. To improve comfort, there will be a seat modification available in the near term, and a different seat option available in a year (or so). Battery swapping between Los Angeles and San Francisco should be online in a few months. The company has analyzed energy usage in production process and claims energy payback happens in less than 10,000 miles. May release white paper on this soon. For lots more tips and tidbits (home energy-storage unit, anyone?) scroll down to watch video of the Netherlands exchange. The Norwegian event – held in a theater because of the crowds – can be viewed at this link. This content is hosted by a third party.

Recharge Wrap-up: Tesla road rage video, Mazda tests EVs vs. hybrids

A Tesla Model S driver was caught driving recklessly in a dashcam video. On Toronto's Don Valley Parkway, the driver of a white Model S can bee seen speeding along the left shoulder. Another car moves partway onto the shoulder to block the driver, who moves back into the left lane. As traffic slows, the driver pulls back onto the shoulder and speeds away. The folks at Teslarati suggest that this serves as an example of why vehicle autonomy could make the roadways safer. See the video above, and read more at Teslarati. Formula E will be broadcast live on Italy's Rai network for the next two seasons. The programming will include the live races, as well as practice and qualifying highlights, podium celebrations, interviews and other pre- and post-race coverage. "It's a great opportunity for Formula E and motorsport fans to have Rai broadcasting the live races of our series in Italy," says Trulli Formula E team owner Jarno Trulli. "It's a step forward to make the series grow and get stronger after a successful first season. I'm looking forward to cooperate with Rai and show the Italian fans what we are truly doing with our technology." Read more from Formula E. A new study links a decline in cancer risk to California's air quality regulations. The study from CARB found that cancer risk from toxic air contaminants declined 76 percent from 1990 to 2012, a time period that corresponds with regulations targeting those contaminants. Even as the amount of diesel miles driven has steadily increased, cancer risk from diesel particulate matter has declined significantly. The paper predicts that cancer risk will continue to drop as a result of controls on toxic emissions. Read more at Green Car Congress. Mazda is conducting consumer trials of hybrid and electric vehicles in Japan to gauge reception. Depending on whether hybrids or EVs prove to be more popular, Mazda will adopt one of the two types of powertrain for future production vehicles. The automaker is currently testing an electric Mazda2 against a hybrid Mazda3. While this round of testing is focused on the automaker's home market, Mazda may need to expand trials to the US in response to tightening regulations in California. Read more at Green Car Reports.