1972 Chevrolet Chevelle Super Sport Replica 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.

2015 Chevrolet Silverado 1500 Custom Sport Quick Spin

Coincidentally, the week we had the 2015 Chevrolet Silverado 1500 Custom Sport a friend asked, "What would you buy if you could only have one vehicle for everything?" After a week's driving and trailer hauling, very close to first choice would be an American pickup. They're all so good now, you can't lose. And as we found in the Chevy you can go anywhere and haul anything, and you pay no penalty for capability until you try to find an open space on the street to park. Nicely equipped versions like the Custom Sport aren't cheap, but if you need a truck and you like the look of this one, it is really good. Driving Notes The cabin is big and inviting, and everything in it is big and inviting. The materials are nice enough to look and feel swanky but not so lavish that you're afraid to get them dirty. The seats are sized for adult male bears but they don't swallow you up. The sunroof is big enough to be an observatory. It's also quiet. The only time it gets mildly unruly is when you call for power and the engine has to downshift a few gears, otherwise you don't hear the exhaust unless you roll down the window. It looks like it was designed with a T-square. I quite like it, the body-colored bumpers toning things down, the 20-inch wheels doing a much better job of filling those ample arches than the standard 17-inchers. The truck is built for people who take their work and all their gadgets with them. The front console has three USB ports, two 12-volt cigarette lighter ports, and a three-prong 110-volt outlet. The giant cubby at the base of the console has an insert to hold a clipboard or a small tablet. The abyss under the center armrest has one more 12V cigarette lighter, two more USB ports, an SD card reader, and another specialized holder for something the size of a small tablet. There's a WiFi hotspot so the streaming never has to stop. The Chevrolet navigation was trouble-free as usual, and you can input destinations on a QWERTY touchscreen keyboard. Every nav system should be so solid. The Silverado has some of the best feature implementations we've encountered in any vehicle. The lane departure warning and park assist systems don't vibrate the steering wheel, they vibrate the seat. The left, right, and middle of the seat bottom will pulse as necessary, an intuitive, peripheral way to deliver a message that doesn't interrupt your primary focus. The rear-view camera is no longer offset, it's centered.

That time we lapped Indy with Tony Kanaan in a Corvette Z06

We're here in Indianapolis, IN, attending this weekend's 99th running of the Indy 500. The big event happens tomorrow, but the city is buzzing today with all sorts of pre-race festivities. For us, that means checking out Indianapolis Motor Speedway a day early, and getting a hot lap around the racetrack in the official Indy 500 pace car – a 2015 Chevrolet Corvette Z06. Our driver for the occasion is IndyCar racer Tony Kanaan, who won the Indianapolis 500 in 2013. Of course, he'll be competing tomorrow, leaving pace duties to none other than Jeff Gordon. Check out our minute-and-a-half-long lap of the Indy 500 track in the video above, where Kanaan hugs the wall in true race style, getting the Z06 past 150 miles per hour on the back straight. Stay tuned for more Indy 500 coverage later this weekend.