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New Jersey Governor Chris Christie has signed a law making rolling coal illegal in the state. The bill was introduced less than a year ago after a pickup belched soot on a State Assemblyman's Nissan Leaf.

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The new Land Rover Discovery Sport is now being offered (in certain markets) with the frugal new Ingenium diesel engine, available in two states of tune.

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German automaker Audi created a few gallons of synthetic fuel from water and carbon dioxide this month, with plans for more on the way.

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PEMS Testing Shows Higher-Than-Allowed NOx Emissions

A study analyzing real-world diesel vehicle emissions finds that NOx levels from modern engines far exceed the mandated limits. However, the carbon monoxide and total carbon hydrogen numbers are where they should be.

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Over 1,357 Mostly Highway, Miles, We Get 42 MPG

Over 1,300 miles in a diesel-powereed Chevy Cruze between Michigan and West Virginia, our columnist find a deeper appreciation for oil burners.

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Volkswagen enlists the Three Golden Sisters - a trio of New York grandmothers - to help dispel erroneous ideas about diesel engine in four new 30-second commercials, with help from Tanner Foust and Tuna the Dastardly Dog.

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Fuel Cell-Diesel Parity Could Happen in 7-15 Years

Toyota executive says the company could bring the cost of a fuel-cell vehicle to about what a diesel vehicle costs in the next 7-15 years.

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Jeep will be adding the 3.0-liter EcoDiesel V6 and ZF eight-speed automatic to the next-generation Wrangler, an inside source confirmed to Autoblog.

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Japanese Automaker Touts Fuel Efficiency, Improving Reputation For Diesel Emphasis

Mazda says its CX-3 compact crossover will exclusively be diesel-powered in Japan.

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Volvo, Audi Already Taking Plug-In Diesel Plunge

Adding electric motors to diesel engines may help cut air pollution, and that could save the technology in a now-critical Europe.

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Critical Look At Diesel Engines Could Benefit Hybrids

Ford doesn't expect the Mondeo Hybrid to be a huge sales success in Europe. However, with governments there backing away from supporting diesel fuel, the sedan offers a hedge against future changes in the market.

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France Looks to Improve Air Quality, Get Older Diesels Off Its Roads

The French government may give a 10,000-euro incentive to people who trade in old diesels for electric vehicles.

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The European diesel backlash is continuing, as a member of the British government has come out against the popular fuel.

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A newly released study finds that the emissions from post-2007, EPA-compliant diesel engines do not show risks of causing lung cancer in lab rats. The animals were exposed to the exhaust for 80 hours a week for up to 30 months. Previous studies have shown much more adverse effects from older diesels.

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Porsche may be getting rid of the V8 diesel option for the Cayenne SUV because upgrading to comply with European emissions standards is pricey.

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The newly unveiled Ram 1500 EcoDiesel HFE model brings the fullsize pickup closer than ever to 30 miles per gallon fuel economy. Thanks to the right mix of aerodynamics-improving measures, the model boosts the mileage of the standard diesel version to 29 mpg highway, 21 mpg city and 24 mpg combined. Its 3.0-liter diesel V6 still makes 240 horsepower and 420 pound-feet of torque and routes through the brand's eight-speed automatic gearbox.

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Almost all Jaguar Land Rover vehicles will get optional diesel engines in the next three years as part of the company's plans to increase fuel efficiency across its lineup.

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Full Titan Range Will Offer Multiple Engine, Cab, Bed Configurations

The 2016 Nissan Titan XD has arrived at the 2015 Detroit Auto Show, packing a 5.0-liter Cummins turbodiesel V8 with 310 hp and 555 lb-ft of torque. That means when properly equipped, the Titan XD can tow up to 12,000 pounds. Read all about it, here.

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From drag races to roominess comparison, the Mazda3 came out ahead of the Audi A3 and BMW 1-Series in a diesel-hatchback comparison.

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The Renault-Nissan Alliance bills itself as the worldwide leader in electric vehicles with a claimed 58 percent of the global market share. In the highly competitive world of increasingly efficient powertrains, development can never stand still if the company wants to maintain that dominance. Renault just held a show of its latest drivetrain prototypes. The most bizarre of them wasn't electrified, but it was so weird that it needed to be shared.

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Last month, Nissan and BMW helped stem a disconcerting (for green-car watchers, at least) trend of declining year-over-year sales, as increased demand for the Japanese and German automakers' plug-in models made November slightly less painful than October. The year-over year decline of hybrid, plug-in and diesel sales narrowed to 10 percent in November from 13 percent in October, as Americans bought more than 43,000 new green cars. Last month's plug-in sales reversed their temporary decline, incr

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