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AAA ranks Tesla Model S P85D best green car of 2015, Versa is best value

Reviewers from all parts of the automotive world just seem to love the Tesla Model S, whether it's the pragmatists at Consumer Reports or the enthusiasts at Car and Driver. You can add one more to that list because the 2015 P85D grabs the top spot in AAA's fifth annual Green Car Guide, after Tesla's win last year too. The organization's ranking of 88 green models also names the 2014 Nissan Versa SV as the best value in the segment. To take the victory, the P85D had to score the most points over 13 categories, including emissions, acceleration and cargo capacity, and it won handily with 94.87 points. There was nearly a tie for second place, though. The 2015 Volkswagen e-Golf SEL Premium scored 85.5 points, and the 2014 BMW i3 narrowly came in third with 85.4. The best value award is based on the as-tested price per point scored. So while the Versa SV only had 64.5 points overall, its low price meant that each one cost just $249. Second place went to the Versa Note SV with 64.63 points at $260 each, and third was the Hyundai Accent GLS with 61.1 points for $269 each. Keep in mind, AAA's ranking doesn't attempt to find the most environmentally friendly vehicle, rather it tests the green car segment to give recommendations to buyers. Battery electric powertrains, compressed natural gas, clean diesel, hybrids, partial zero-emissions vehicles, and simply models with high fuel economy are all counted by the organization. The results are published in a 160-page magazine, which you can read here. It also offers suggestions on economical driving and explains some of the fuel-saving tech currently available. Related Video: Top Green Vehicle is a 2015 Tesla, According to Fifth Annual AAA Green Car Guide ORLANDO, Fla., April 20, 2015 The 2015 Tesla Model S P85D earned the top score in the 2015 AAA Green Car Guide, the motor club announced today. The Palo Alto-based automaker's car is featured with more than 80 other green vehicles in the 2015 AAA Green Car Guide. The best green car value award went to the 2014 Nissan Versa SV. To help those in the market for a green car or truck, the 160-page, comprehensive fifth annual AAA guide reviews 88 battery electric vehicles, compressed natural gas-powered (CNG) vehicles, clean diesels, hybrids, partial zero emission vehicles (PZEVs), and vehicles with high fuel economy.

Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

2016 Nissan Maxima launches production in Tennessee

The 2016 Nissan Maxima saw its big debut at the end of the brand's 90-second Super Bowl commercial this year. However, we didn't get the full details about the latest generation of the model marketed as the four-door sports car until the recent New York Auto Show. Now just a few weeks later, the sedans are rolling down the assembly line in Smyrna, TN, and they should hit the road this summer. "Today's launch of the all-new Maxima is the beginning of an exciting year for Nissan's US lineup, with new versions of the Altima, Sentra and Titan due later this year," John Martin, Nissan's senior vice president for manufacturing, supply chain management and purchasing, said in the production announcement. The sedan's revised 3.5-liter V6 is also made in Tennessee at Nissan's Decherd Powertrain Plant. The 2016 Maxima certainly looks different than other mainstream sedans with its prominent V-shaped grille, slashing headlights and floating roof. Prices start at $32,410, plus $825 for destination. For that, customers get a 300-horsepower V6 that's connected to what Nissan claims is a "performance-oriented" CVT. The latest model is also estimated to get 30 miles per gallon on the highway. NISSAN BEGINS PRODUCTION OF EIGHTH-GENERATION MAXIMA "4-DOOR SPORTS CAR" IN TENNESSEE NASHVILLE, Tenn. – Nissan's Smyrna Vehicle Assembly Plant continues its reign as the top-producing automotive plant in North America, as Gov. Bill Haslam, U.S. Senator Lamar Alexander and Tennessee Economic and Community Development Commissioner Randy Boyd joined plant employees to celebrate the start of production for the all-new 2016 Nissan Maxima. "When Nissan came to Tennessee more than 30 years ago, there were almost no auto jobs in the state," said Alexander. "Three decades later, about one-third of our manufacturing jobs are auto related, auto suppliers have located in 80 counties, and our family incomes are higher. I want to thank Nissan for providing opportunities for thousands of talented Tennesseans." The first U.S.-assembled Maxima rolled off the assembly line in Smyrna in January 2003. Since then, Nissan has produced nearly 800,000 Maxima sedans at the plant, with more than 60,000 shipped to markets worldwide. Maxima is one of six models currently built at the Smyrna plant and is assembled on the same line as the Altima midsize sedan and all-electric Nissan LEAF. Maxima's new 3.5-liter, VQ-series V6 engine is also assembled in Tennessee at Nissan's Decherd Powertrain Plant.