2014 Mercedes-benz Gl63 Amg Base Sport Utility 4-door 5.5l on 2040-cars

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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

Your guide to vehicle subscription services

They might be extremely limited in scope because of location availability, but vehicle subscription services are a growing trend that most luxury manufacturers are jumping on. Plans are expensive, but you're paying for much more than just the car typically. We highlighted four of the larger plans with a few more listed at the end. Care by Volvo Volvo launched its subscription service last year with its brand-new XC40. It was the only vehicle available for a time, but subscribers can now get an S60 sedan as well. Subscriptions are for two years, with the monthly price including insurance, a concierge service, wear-and-tear item replacements and all maintenance. You'll be able to drive 15,000 miles per year with whichever Volvo you choose, and although there are no options to extend that mileage, you can swap cars after a year. Pricing for the XC40 is $650 per month in base trim, while an S60 can be as expensive as $850 for the R-Design. Volvo's plan is to offer more cars soon through the service, but it's relatively limited compared to others right now. Porsche Passport Porsche has two levels in its subscription service: Launch and Accelerate. Launch will cost $2,000 per month and give you access to the Cayman, Boxster, Macan and Cayenne. All of those but the Cayenne can be had in "S" trim as well. Accelerate is where the fun really starts. For $3,000 per month you can choose from a fleet of 911s, including the S, 4S, Cabriolet and Cabriolet S. If those aren't enough, you can also get the Panamera 4S, Macan GTS and Cayenne S. There are no mileage limits and you can change vehicles as often as you'd like. Also included in the price is insurance, repairs, detailing and any maintenance. It might be extremely expensive and limited to Atlanta only, but this subscription service is second-to-none for what you get. Audi Select Audi just launched its subscription car service, and it's offered in one version for a flat fee of $1,395 per month. For that you'll have access to five different cars including the A4, S5 Coupe, A5 Cabriolet, Q5, and Q7. Not a bad range of vehicles, but it would've been neat to see the recently updated A7 in there too. Maybe in time. Like the others, insurance and maintenance are wrapped up in the price. Audi is allowing for unlimited miles and two car swaps per month here. In addition to that, you'll get two days of free rentals through Audi's Silvercar rental agency should you go on a trip.

2015 Mercedes-Benz S63 AMG Coupe

Conventional wisdom would dictate that adding more power and several key performance enhancements to an already very good car, like the 2015 Mercedes-Benz S550 Coupe, will end up equaling an even better car. In the case of the 2015 Mercedes-Benz S63 AMG Coupe, conventional wisdom sort of applies, but perhaps not as much as we'd have initially guessed. We'll get into the nitty gritty details in just a moment, but here's the most immediate takeaway we had in our minds as we walked away from this super coupe: The S63 AMG is excellent, but so is the slightly more mundane S550 Coupe on which it is based, and which is priced some $41,000 less expensive than its more powerful sibling. Chew on those figures while we examine what differentiates the two S-Class Coupes. Drive Notes As expected, the single greatest highlight of the 2015 S63 Coupe is its engine. As a powerplant, it's a gem. As a hand-built engineering exercise, its 577 horsepower and 664 pound-feet of torque are just as impressive in real life as they sound when recited from stat sheets. Not that the old CL63 AMG was lacking in power, but the new S63 AMG Coupe boasts 41 more horses and 74 more lb-ft than the outgoing engine. The run to 60 miles per hour takes a scant 3.9 seconds, according to M-B, aided in no small part by the car's 4Matic all-wheel-drive system and other assorted electronic brains deciding where, exactly, all those ponies should be sent. The rear-biased system is tuned to send two-thirds of the engine's power to the rear wheels in a bid to make the car feel more like what performance-minded drivers expect. Top speed is electronically limited to 186 miles per hour, which is plenty fast enough, even in the days of 200-plus-mph sedans from M-B's former corporate cousin Dodge. We didn't get anywhere near the car's maximum velocity, but our brief trips into triple-digit territory were quiet, comfortable and completely free of drama. The seven-speed automatic gearbox responds quickly to requests of your right foot, but the steering wheel-mounted paddles don't change gears as quickly as we'd like when in Manual mode. Controlled Efficiency (which we'd call Comfort) maximizes efficiency, keeping the transmission in higher gears and shifting earlier than when in Sport mode, and we didn't find much fault with the computer's shifting algorithms in either setting.