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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.

Jay Leno gets pulled over while roaring in a Corvette Z06 convertible

No one is above the law, even if that person is a certain silver-haired auto enthusiast with a popular weekly video series about the cars in his garage. This week, Jay Leno experiences the 2015 Chevrolet Corvette Stingray Z06, but he also gets to have a meeting with some of California's Finest immediately after a high-speed blast. As opposed to the full-bore Z06 coupe with the seven-speed manual, Leno gets behind the wheel of the slightly heavier convertible version with the eight-speed auto. Being a droptop doesn't bother him too much, but Leno makes it obvious he wishes that he could be shifting for himself. Even if the auto is technically quicker, Leno says that swapping gears gives him something to do while driving. Of course, one of the major advantages of the convertible is the ability to listen to the Z06's thumping V8 unimpeded. With 650 horsepower and 650 pound-feet of torque from 6.2-liters of supercharged muscle, it already puts down impressive numbers, but the sound might just be the best part of all. Around town, the 'Vette is quiet enough to easily blend in with the rest of traffic. However, tip the throttle down and the valves in the exhaust open up to turn the engine into roaring monster. Be careful where you make this thing howl, though, because it's pretty easy for the police to take notice. The host finds that out the hard way in this week's episode of Jay Leno's Garage. Related Gallery 2015 Chevrolet Corvette Z06 Convertible View 18 Photos News Source: Jay Leno's Garage via YouTube Celebrities Chevrolet Coupe Performance Videos Jay Lenos Garage chevy corvette stingray chevy corvette z06

Since 2010, Chevy Volt has outsold Nissan Leaf by just two units

The first two plug-in vehicles from major automakers in the US were the Chevy Volt and the Nissan Leaf. Ever since they went on sale to much fanfare in late 2010, we've been tracking the monthly sales with great interest (and, of course, other green vehicle sales as well). After a big initial lead by the Volt – the Volt outsold the Leaf 23,461 to 9,819 in 2012 – the Leaf has been chugging along and outsold the Volt every month since November 2013. We knew that the cumulative totals would soon tip in favor of the Leaf, but for at least one more month, the Volt is going to be able to say its the most popular plug-in vehicle in the US. Overall, for all officially reported sales of the Leaf and the Volt, things are almost exactly tied. Since the vehicles went on sale in the end of 2010 until the end of February 2015, the Volt has sold 74,592 units and the Leaf has sold ... drumroll please ... 74,590 units. For February, Leaf sales totaled 1,198 units, a 17-percent drop from the 1,425 Leafs sold last February. Brendan Jones, Nissan's director of Electric Vehicle Sales and Infrastructure, said in a statement that, "Tough winter weather in several key markets held EV sales back in February. As we head into spring, we look forward to seeing more dealership traffic so shoppers can experience firsthand the benefits of the all-electric Nissan Leaf." Of course, it was cold in the US last February, too, but we're sure that the nasty weather did indeed play a role last month. Things were even worse for the Chevy Volt, which dropped to just 693 copies sold, down 47 percent from the 1,210 sold last year. That's just barely enough for Chevy to keep talking about its plug-in sales leadership, but we expect the message to change once the March numbers come out next month. Related Video: