2009 Chevy Impala - Lot #657 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.

Chevy Spark EV will go on sale in Maryland

The single-charge range of a Chevrolet Spark electric vehicle may not blow away anyone who's used to driving on a topped off tank of gas. But a full charge will actually get a Spark EV about halfway across the state of Maryland. Which is good because that state will be the first on the East Coast to sell the battery-electric model. General Motors said this week that Chevy Spark EV sales will start in Maryland this spring, and that federal and Maryland tax credits will get the out-of-pocket price of the Spark EV below the $18,000 threshold. GM took the opportunity to tout the Spark EV's 119 miles per gallon equivalent rating and says Maryland has sufficient charging infrastructure for drivers to welcome the EV without too much trouble. Last June, Spark EV distribution was reported to be ready to extend beyond the Pacific Coast. Specifically, Ohio was thought to be next in line to get Spark electric vehicles after four state car dealerships listed the model on their websites. GM's Randy Fox, however, quashed that real quick, saying only California and Oregon had sufficient infrastructure to support the Spark EV. GM first announced the Spark EV for public (or at least American) consumption back in 2011. Last year, the General sold 1,145 Spark EVs, up 87 percent from 2013. For more on the Maryland expansion, take a look at GM's press release below. Chevrolet Spark EV Plugs into Maryland Customer demand drives addition of East Coast; features locally sourced drive unit 2015-01-22 WASHINGTON, D.C. – Chevrolet will start selling the Spark EV in Maryland this spring, expanding the pure electric mini-car's "range" to the East Coast. The Spark EV is the most efficient U.S. retail electric vehicle on the market, delivering an EPA-estimated combined city/highway 119 MPGe fuel economy equivalent and 82 miles of EPA-estimated combined city/highway range. It is priced as low as $17,845, after federal and Maryland tax credits – and it features a locally sourced electric motor and drive unit, manufactured at General Motors' Baltimore Operations facility in White Marsh, Md. "The Spark EV has been one of the most well-received electric vehicles in the industry and customer demand helped make the decision to expand its availability to Maryland," said Steve Majoros, Chevrolet director of car marketing.

2019 Chicago Auto Show photo gallery: All of the grilles

Do you like trucks? How about grilles? Like really big, shiny, chromey, in-your-face, could-be-made-by-Broil-King grilles? Well, the Chicago Auto Show is the place to be. Traditionally known as the truck show of the annual auto show circuit (at least those covered by national media), Chicago has what seems like a small national park's worth of acreage devoted to both consumer and commercial trucks. From humble extended cab Ford Rangers to a mammoth F-650 with cherry picker sprouting from its aft quarters, there's bound to be a truck for everything. And they all have grilles. So above is our gallery devoted to them, because hell, why not? Should you want to know about the trucks attached to those grilles, check out our coverage below. Heavy Duty Trucks 2020 Chevrolet Silverado HD revealed, tows 35,500 pounds 2020 GMC Sierra HD revealed, has more subtle looks than Chevy sibling 2019 Ram Heavy Duty trucks get new face, 1,000 pound-feet of torque 2020 Ford F-Series Super Duty revealed, adds massive gas engine Full-Size Trucks Read how all of the full-size trucks compare to each other 2019 Chevrolet Silverado First Drive 2019 Chevrolet Silverado 2.7L Turbo First Drive 2019 GMC Sierra First Drive 2019 GMC Sierra AT4 First Drive 2019 Ram 1500 Laramie Quick Spin Review 2019 Ram 1500 eTorque Drivers' Notes Review 2019 Ford F-150 2.7L EcoBoost Quick Spin Review 2018 Ford F-150 King Ranch Power Stroke Diesel Review Related Video: Featured Gallery 2019 Chicago Auto Show: All of the grilles View 40 Photos Chicago Auto Show Chevrolet Ford GMC RAM Truck chevrolet silverado