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This map reveals the cleanest vehicles based on location

Naysayers love to point out how dirty the electricity grid mix is when it comes to charging electric vehicles. Curmudgeons are eager to jump into any conversation about EVs to enlighten the lucky listeners about how plug-in cars contribute to pollution, sometimes even throwing in a dash of climate-change denial for good measure. (Thanks, buddy. Pray, tell me more about the plight of oppressed SUV owners.) Unless someone buys an EV just because they think they're cool (which, yeah, they often are), they probably have at least a passable understanding of their environmental pros and cons. As many EV owners are already aware, location has a lot to do with any particular plug-in car's carbon footprint. Still, there's always more to know, and knowledge is not a bad thing, especially if one uses it to do the right thing. That's why this handy-dandy map from Carnegie Mellon University is so interesting. CMU researchers have compiled information about the lifecycle greenhouse gas emissions of various EVs based on where they're charged, as compared to gasoline-powered vehicles. The researchers looked at the Nissan Leaf, Chevrolet Volt, and Prius Plug-In Hybrid versus the gasoline-dependent Toyota Prius hybrid and the stop-start-equipped Mazda3 with i-ELOOP and compared grams of CO2 emitted per mile. CMU takes into account the grid mix, ambient temperature, and driving patterns. CMU takes into account the grid mix based on county, as well as ambient temperature and driving patterns in terms of miles traveled on the highway or in the city. For instance, if you drive a Nissan Leaf in urban areas of California, Texas, or Florida, your carbon footprint is lower than it would be if you were driving a standard Toyota Prius. However, if you charge your Leaf in the Midwest or the South, for the most part, you've got a larger carbon footprint than the Prius. If you live in the rural Midwest, you'd probably even be better off driving a Mazda3. Throughout the country, the Chevrolet Volt has a larger carbon footprint than the Toyota Prius, but a smaller one than the Mazda3 in a lot of urban counties in the US. The Prius and Prius Plug-In are relatively equal across the US. Having trouble keeping it straight? That's not surprising. The comparisons between plug-in and gasoline vehicles are much more nuanced than the loudest voices usually let on.

Pretty scenery alert: Nissan Leaf drives up a volcano on Maui

Gravity taketh away but gravity giveth back, Nissan is trying to teach all of us. The Japanese automaker has posted a two-minute video about Maui resident Neil Wagner using his Nissan Leaf to catch the legendary sunrise over the volcano in Haleakala National Park. After climbing the more-than-10,000-foot elevation, the Leaf is shown having lost about 84 percent of its usable battery capacity. The finer point, though, is that electric vehicles have a regenerative braking system, meaning that the downhill ride and all of its switchbacks actually replenish battery capacity. Of course, the video didn't show exactly how much of that capacity was replenished, but the point is well-made, and with really cool scenery. Sales for the Leaf have already been strong this year. Through the first three months of the year, Nissan boosted sales 46 percent from 2013 numbers up to 5,184 units. This is after more than doubling sales last year to 22,610 units. And, for anyone curious, there are six publicly-accessible plug-in vehicle charging stations in Kahului and another eight in Lahaina, two of Maui's largest cities, according to the US Department of Energy. We're pretty sure that Mr. Wagner already knows that but we're going to take notes in case we need to make the sunrise drive one day. For now, we're going to check out Nissan's two-minute video below one more time. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Nissan is optimistic about FCA partnership, but wants the right terms

BEIJING – Nissan is optimistic about partnering with a combined Renault and Fiat Chrysler (FCA), as long as it can protect the ownership of technology developed over two decades of working with Renault, a senior executive told Reuters. The executive, who declined to be identified because he is not authorized to speak to the media, said he was cautiously optimistic about the possibility of generating "synergies" by sharing Nissan's autonomous drive know-how, electrification and greenhouse-gas-scrubbing technologies for powertrains. But he said the possible $35 billion merger of Renault and FCA would not give FCA the automatic right to use those technologies, which it needs to meet stringent emissions regulations and better compete in a industry being transformed by electric vehicles. He also floated the possibility that Nissan could look at boosting its stake in Renault, or a merged Renault-FCA, to gain more say in shaping the future of the alliance. "We would go ahead with partnering or cooperating with FCA only if we can guarantee tangible benefits from sharing technologies with FCA and only if we can work out conditions that are satisfactory to us," the Yokohama-based executive said. "If Renault wants to pursue this deal, we feel we need to look seriously at supporting them," he said. The executive's comments highlight how Nissan could look to leverage its advanced technology to gain greater bargaining power with a merged Renault-FCA. Renault is Nissan's top shareholder with a 43.4% shareholding, while Nissan holds a 15% non-voting stake in the French automaker. That unequal partnership has long rankled Nissan, which is the bigger company by far. A Nissan spokesman referred Reuters to a statement issued on Monday, where Nissan Chief Executive Hiroto Saikawa said: "I believe that the potential addition of FCA as a new member of the alliance could expand the playing field for collaboration and create new opportunities for further synergies." "That said, the proposal currently being discussed is a full merger which — if realized — would significantly alter the structure of our partner Renault. This would require a fundamental review of the existing relationship between Nissan and Renault," Saikawa said, adding that Nissan would analyze and consider its "existing contractual relationships". BOOSTING STAKE?