Nissan 370z Nismo Year 2010 on 2040-cars

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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.

FCA scion John Elkann tries to pull off a Marchionne-sized merger

MILAN, Italy — When John Elkann lost his ally last year with the sudden death of Sergio Marchionne, some questioned whether the softly-spoken scion of the Agnelli clan would be able to emerge from his shadow to ensure Fiat Chrysler's future. But New York-born Elkann, who became Fiat chairman in 2010, acted decisively to fill the vacuum left by the larger-than-life Marchionne and get closer to the big merger deal the legendary executive was unable to deliver. At just 28, Elkann was thrust into the role of Fiat vice chairman after the deaths of his grandfather and great-uncle "because there was really nobody else" to take the wheel. For Elkann, who got his first taste of the car industry as an intern at a factory producing headlights in Birmingham, England, the first 18 months with responsibility for the family-owned carmaker and its long heritage were "terrible." But from that low point, Elkann, 43, is now trying to merge Fiat Chrysler (FCA) with French rival Renault to form the world's third largest carmaker and tackle new challenges facing the industry. Elkann will become chairman of the merged FCA-Renault if the deal goes ahead, ensuring the Agnelli dynasty plays a central role in the next chapter of automotive history. At an event in Milan on Monday, the usually-shy Elkann looked happy and confident. His first big break came with an instrumental role in persuading Marchionne, who was running one of the businesses owned by the Agnelli family, to become chief executive in 2004 and give Fiat "a new start," Elkann said in a "Masters of Scale" podcast last year. Fiat was at the time almost on the brink of collapse. This involved a "very long night ... and many grappas" but proved to be a turning point in the fortunes of the Italian company founded by Elkann's great-great-grandfather Giovanni Agnelli, which built its first car in 1899. In 2005, Elkann backed Marchionne in negotiating the breakup of an alliance Fiat had entered into with General Motors in 2000, receiving $2 billion from GM in return for canceling a deal that could have required GM to buy the remainder of Fiat Auto. Marchionne then used GM's money to fund a turnaround at Fiat, which involved taking the Italian carmaker into a transformation alliance and then full-blown merger with U.S. automaker Chrysler as Elkann agreed to the Agnellis loosening their grip.

Nine cars we wish were convertibles

The snow has melted, the sun is shining, and the days are getting longer. At the Autoblog Detroit office we feel like our winter hibernation is finally over. And with warmer temperatures come visions of opening up a convertible roof and cruising. You know, just turn up the bass and let the Alpine blast. There are plenty of droptops on sale in the US, and more on the way (like the 2016 Mazda MX-5 Miata). That said, we always want more. More! More! More! In that spirit, we cooked up a list of nine cars aren't currently sold as convertible, but ought to be. Check out our picks, below. Summer's just around the corner. Subaru BRZ / Scion FR-S In some parallel universe, this car actually happened. Toyota showed us a FT 86 Convertible concept at the Geneva Motor Show in 2013, and we immediately started licking our chops over the thought of a rear-wheel-drive convertible based on the Subaru BRZ and Scion FR-S twins. These days, the MX-5 Miata is our only option for affordable roadster fun. A competitor to the Mazda seems like a no-brainer to us, especially since we have naught but good to say about the BRZ/FR-S as-is. Unfortunately in our present timeline, this car is as likely for production as a BRZ STI. Which is to say, not very. Dang. Lexus RC F Unlike the FR-S, a convertible from Toyota's luxury division might actually see the light of day. The current IS convertible is about to be phased out, and the Lexus LF-C2 concept from the 2014 Los Angeles Auto Show is really a thinly veiled look at a possible RC convertible. A droptop RC would be plenty good, but let's reach for the starts. What we really want is to run topless in an RC F, complete with that powerful, loud, 5.0-liter V8 engine. Lexus says the RC F is a true competitor to the BMW M4. If that's true, it only makes sense for Lexus to mimic the Germans and offer its performance coupe in a folding hardtop form. Maybach Landaulet Maybach is bach back, recast as an upper crust trim level for Mercedes-Benz. The Mercedes-Maybach S600 is seriously awesome, and more luxurious than a trip to the spa. But why not go a step into the truly ridiculous levels of extravagence and bring back that open-top Landaulet? We think your local princess will love this idea, and with better S-Class bones underneath, Jeeves will have a pretty enjoyable ship to steer, too. Besides, with that slick new Mercedes design language, a Landaulet redux wouldn't be nearly as hideous as the old model, pictured here.