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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.

Valet mode captures joyride in red Corvette

A man in California is among the first to catch a valet behaving badly in his 2015 Corvette using a controversial built-in recording feature. Dan Cowles told KTLA 5 when he bought his dream car, a 2015 Chevrolet Corvette Stingray, he opted for the Performance Data Recorder. The Corvette PDR uses a high-definition camera mounted in the windshield header, a microphone in the cabin and a GPS receiver that record and track the sports car's movements and sounds. They work together to produce a video with telemetry overlay, so you can see acceleration rates, lap times and g-forces. The system can be customized to show extensive performance data, or simply video of your drive like a traditional dash cam. It also comes with Valet Mode, which locks the glove box, disables entertainment and records video. The audio recording feature ran afoul of several state's recording consent laws, but this video has no audio, indicating the fix may have been as easy as turning off the microphone. Cowles dropped off his hot red 'Vette with the valets at the Segerstrom Center for the Performing Arts in Costa Mesa, CA. When he got his car back he checked the PDR and discovered footage of the valet taking a short, but intense, joyride in the garage. In the video, the valet finds a straightaway in a tiered parking garage and pushes the car to 50 miles per hour in five seconds before quickly stopping. He then parks the car without incident. The valet then gets out of the car and takes one more admiring look at the front. The valet company has yet to commented on the video, according to Fox News, but valets everywhere should be on notice; that little red Corvette you have your eye on may have its eyes on you. Related Gallery Ward's 10 Best Engines of 2015 View 10 Photos Chevrolet Driving Classics valet parking

GM warning 800,000 owners that their cars may need oil changes more frequently than they say

The days of changing your engine oil every 3,000 miles are long gone thanks to most cars having automatic oil monitoring systems, but about 800,000 General Motors vehicles apparently have incorrect monitoring software that is leading to premature engine component wear. According to Autoweek, certain 2010-2012 Buick LaCrosse, Regal, Chevrolet Equinox and GMC Terrain models equipped with 2.4-liter four-cylinder engines could be going too long in between oil changes resulting in a higher-than-normal number of warranty claims for the engine's balance chain. The balance chain links the balance shaft to the crankshaft, and a worn one can produce higher noise levels.
As a fix, GM dealers will be reprogramming the software for the monitors in an effort to reduce the interval between oil changes, which varies based on driving habits and conditions. Through February 2015, the software update will be done at no cost to vehicle owners, but since this is not a recall, after that point, it will be up to the discretion of dealers as to whether or not they will charge for the service. What isn't immediately clear is whether GM plans on giving assistance to out-of-warranty customers who are experiencing engine issues from the worn chain.