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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.

2015 Chevy Silverado Custom Sport is subtle in black

In a world where trucks are growing bigger, bolder grilles and more muscle-bound looks, Chevrolet is trying something a bit different with its recently revealed Custom Sport edition for the 2015 Silverado at the this year's Detroit Auto Show. The edition leans on being understated, instead of screaming about its abilities. The design is supposed to be a throwback to the Chevy Custom Sport Trucks of the late '60s that brought a touch of elegance to these usually utilitarian vehicles at the time. The heart of the package is its monochromatic body-color touches for the bumpers and grille surround. The one on display at the show is especially attractive with a chrome-accented black grille that fits perfectly with the rest of the body. The edition does get a bit more shine with chrome covering the 20-inch wheels, door handles, mirror caps and side moldings. In addition, buyers get projector beam headlights, tow hooks and heated power mirrors. The custom package is available on the LT trim in black or white and on the LTZ in black or White Diamond Tricoat. Take a look at this monochromatic take on the Silverado as it sits in the Motor City. 2015 SILVERADO OFFERS CUSTOM SPORT PACKAGE Inspired by Chevy Custom Sport Trucks that helped launch personal-use pickups DETROIT, 07/01/15 – With the new 2015 Silverado Custom Sport special edition, Chevrolet pays homage to one of its most iconic pickups, adding a sophisticated monochromatic look to double- and crew-cab Silverados. The Custom Sport package features body-colored front and rear bumpers and a body-colored grille surround with a chrome-accented black grille. Other accents include 20-inch chrome wheels, chrome door handles and mirror caps, and chrome body-side moldings. The package also includes projector beam headlamps, tow hooks and heated power-adjusted mirrors. "The Custom Sport special edition was inspired by Chevy Custom Sport Trucks of the late 1960s," said Sandor Piszar, Chevrolet Trucks marketing director. "Those CST models added a touch of elegance to a great all-around truck, just like the Custom Sport package for the new Silverado." The redesigned 1967 Chevrolet pickup entered the market at a time when trucks were starting to move off the jobsites and into the driveways of cities and suburbs. The 1967 Custom Sport Truck, with its bright trim, plush carpet and bucket seats, helped launch a wave of personal use pickups that continues today.

2015 Chevy Volt gets larger battery, though range remains the same

The Chevrolet Volt isn't changing much for the 2015 model year. According to specifications uncovered by Inside EVs, though, the new Volt's battery does have a slightly larger capacity. According to the spec sheet, this doesn't translate to increased range. Real world driving, though, might tell a different story. The 2015 Volt's battery storage is slightly higher than the outgoing model's, up from 16.5 kilowatt-hours to 17.1 kWh. According to GM's manager of electrification technology communications, Kevin Kelly, speaking to Green Car Reports, the increased capacity is "a late change done in the cell... just another continuous improvement to surprise and delight our customers." The stated electric range, however, stays at 38 miles. Inside EVs followed up on its original report, and found that drivers could see some advantage to the battery tweak. When they spoke to Kelly, he told them, "As a result of this change, we would expect that some customers may see a slight improvement in overall EV range." It's worth noting that when battery capacity increased from 16 kWh to 16.5 kWh for the 2013 Volt, electric range increased by three miles to the current 38, while MPGe went from 94 to 98. The price of the 2015 Chevrolet Volt remains steady, at $34,995. The actual cost to the customer is considerably less with the $7,500 federal tax credit, as well as any local incentives.