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These are the 'Greenest' and 'Meanest' cars in 2015

As has become tradition, the American Council for an Energy-Efficient Economy (ACEEE) has come up with a ranking of what it refers to as the "greenest" cars of 2015, and, by way of contrast, a list of the so-called "meanest" cars, so those who value eco-friendliness over all else can choose which vehicles they should or should not consider buying. As you may expect, electric cars make up the majority of the greenest cars on the list, but, perhaps surprisingly to many, the Tesla Model S didn't make the cut. It's worth noting, too, that where the electricity an owner uses to charge their electric vehicle has a big impact on its overall environmental impact. "A car that is charged using electricity generated from natural gas or renewables is going to have significantly less impact on the environment than one charged on a coal-heavy grid," says ACEEE lead vehicle analyst Shruti Vaidyanathan. The ACEEE's list for 2015 looks very different than it did in 2014. It's an interesting collection, though – and we're sure this goes without saying, really – we'd recommend doing a bit more research into each vehicle and how it might fit into your daily life before making any purchase decisions. Click here to see the ACEEE's list of the Greenest and Meanest vehicles sold in the United States in 2015. Green Bugatti Chevrolet Fiat GM GMC Mercedes-Benz Nissan RAM smart Toyota greenest greenest cars

Supercharged 2015 GMC Yukon Denali sounds evil, runs 0-60 in 4.5 seconds

Speeding along in a sports car is undoubtedly a ton of fun, but some owners need the ability to carry a lot of people and their stuff and don't want to sacrifice the ability to put the power down. The tuners over at Hennessey have that demographic covered with their growling, supercharged power kits for the GMC Yukon Denali. The upgrades come in three forms for the SUV's 6.2-liter V8: HPE550 with 557 horsepower, HPE600 with 605 hp and HPE650 with 665 hp. This video showcases the full-bore version, and this Denali can definitely hustle in a straight line. The power bump comes courtesy of a 2.9-liter supercharger, intercooler and high-flow cylinder heads to add over 200 horsepower compared to stock, and the final result is a bellowing SUV that rears up off he line to throw the driver back into the seat. The sprint to 60 miles per hour lasts just 4.5 seconds. Check out this hasty hauler in action in the video above.

GMC has received 65,000 Hummer EV orders so far

The GMC Hummer pickup truck only just went on sale, and already there's word from company brass that demand is higher than expected. According to a report from CNBC, Duncan Aldred, global vice president of GMC, said the automaker has received more than 65,000 combined orders for the current electric truck and upcoming SUV. What's more, the number of customers converting reservations into orders is humming along at 95%, which is also higher than the company projected. "Production’s actually slightly ahead of plan and weÂ’re putting things in place now to actually expedite that as well, so we can deliver these reservations quicker than we originally thought," Aldred said, adding that new orders placed today probably won't result in a delivered vehicle until 2024. "WeÂ’re doing all the studies on that and weÂ’re confident we can go a lot quicker than we originally thought," Aldred said, "But it still means a reservation now probably means delivering in Â’24." The version of the Hummer pickup that's currently being built is the highest-spec Edition 1 model. That truck ran at least $110,295, but since it's already sold out, new customers will be looking at Hummer EV 3X that starts right around the $100,000 mark before any optional equipment is added (and assuming you can find a dealer that won't try to jack up the price). At some unspecified point in the next year or so, GMC will start building a lower-cost Hummer 2X for $89,995. A year or so later, the  $79,995 Hummer EV 2 will make its debut. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.