1993 Mazda Rx-7 Base Coupe 2-door 1.3l 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.

Latest Forza Motorsport 5 car pack leaves us scratching our head (in a good way) [w/video]

As we scrolled down the roster of the latest car pack for Forza Motorsport 5, the Hot Wheels Car Pack, our expression became bemused over the strange mix of vehicles that we now have at our disposal. This is quite unlike any of the other sets of DLC Turn 10 Studios has offered. Sure, there are the typical headliner cars – the Lamborghini Veneno and 2015 Audi S3 – that will appeal to the mainstream racing fan or auto enthusiast. But this latest car pack is so jammed full of nuggets of automotive weirdness that it's hard not to get excited. The Hot Wheels pack has no shortage of racers, with a particular focus on historical offerings. A 1939 Auto Union Type D covers the pre-war era of Formula One, while a 1967 Lotus 49 and a 1952 Ferrari 375 represent post-war racing. For a modern twist, a Mazda USF2000 car slots in below the Indy Lights car from the Nurburgring booster pack. From here, things get vintage and weird. There are a pair of delightfully offbeat coupes, in the form of a 1974 Toyota Celica GT and a 1973 Ford XB Falcon GT (here's hoping we get a vintage Holden Monaro in the future). Those two are joined by a 1956 Ford F-100, which your author already plans on converting into a dragster with vinyl flames down the side (because that's what all vintage pickups should be). The new ride we're most excited about, though, is the 1983 GMC Vandura G-1500. Yes, that's the van from The A-Team, and we're sure it will prove to be an excellent canvas for the artists of FM5 to cover with airbrushed, fire-breathing unicorns and mystical, gray-haired wizards (or just poorly painted letters that read "Free Candy"). This latest car pack is the final monthly car pack for FM5, although Turn 10 is quick to point out that while the monthly updates are over, there will still be new batches of cars made available to gamers. As for the Hot Wheels pack, it's available now on Xbox Live for $9.99. Scroll down for the press release from Turn 10 Studios, as well as a video of the newest additions to Forza Motorsport 5's vehicle roster. Forza Motorsport 5 Hot Wheels Car Pack Now Available Turn 10 Studios is bringing the Hot Wheels® Car Pack to "Forza Motorsport 5," available for download today. The pack features a collection of vehicles built from the ground up for the new generation that car fans can collect and customize while putting their virtual driving skills to the test.

Reminder: Come hang out with Autoblog and the 2016 Mazda MX-5 Miata on Tuesday, May 19

Do you love chilidogs, French fries, meeting new friends, and the world's most popular convertible? Do you live in Southeast Michigan? Do you like lists of questions? If you answered "yes" to any but the last of those, we'd like to invite you to a little get-together we're hosting next week. Driving impressions are still under embargo for the US-spec 2016 Mazda MX-5 Miata, but somehow we've conned convinced company PR reps to show the car to you, Joe Public Autoblog Reader. We're enthused about telling you more about the ND Miata, but before we do we'd love to share a Coke and talk about cars. Here's the skinny. A group of Autobloggers will be hanging out at the Athens Coney Island, in Royal Oak, MI, next Tuesday, May 19. We'll have the car on display from 5:00 PM to 8:00 PM, and we'd love to see you. If you're a Miata owner, we'd also love to for you to bring your car along for the party. The more convertibles the better (just be prepared to have your picture taken). Go ahead and set your navi for Athens – 32657 Woodward Ave., Royal Oak, MI 48073 ­– and we'll look forward to seeing you Tuesday. Mazda Geeks unite. Related Video: