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Finalists for 2014 Green Car of the Year announced

The list of finalists for the 2014 Green Car of the Year has been announced, and in a genuinely bizarre twist, there's only one hybrid and no electric vehicles among the five contestants, despite the arrival of cars like the BMW i3 and Tesla Model S. Taking the place of the EVs are a pair of diesels, repping a technology that last won a Green Car of the Year award in 2009, when the Audi A3 TDI took the title. No diesel was in the running for last year's award.
Naturally, both of the diesel finalists are fielded by the Germans - with BMW's 328d and Audi's A6 TDI getting the nod. In the case of the 3 Series, BMW installed a 2.0-liter, turbodiesel, capable of delivering 180 horsepower and 280 pound-feet of torque, while returning 45 miles per gallon on the highway. Audi and its larger, 3.0-liter, V6 turbodiesel produce quite a bit more grunt, with 240 hp and 428 lb-ft of grunt, but net a very impressive 38 mpg on the highway in the A6.
Finalists for this year's awards include two diesels, three gas-powered cars and a plug-in hybrid.

2014 Mazda3 officially rated at 30/41 mpg, priced from $16,945*

It's hard not to be smitten with the 2014 Mazda3; after all, just look at it. But beyond its slick lines, we found the new compact hatch to be a pretty remarkable steer, offering up good levels of comfort and refinement, not to mention functionality and engagement. Now, there's more reason to like the 2014 Mazda3, as we've just learned that the car will officially be rated at 30 miles per gallon city and 41 mpg highway.
That 30/41 rating is for the Mazda3 sedan fitted with the 2.0-liter Skyactiv-G inline four-cylinder engine and a six-speed automatic transmission. Opting for the manual transmission retains the 41-mpg highway number, but drops the city digits to 29. Hatchback models with the 2.0-liter engine achieve 29/40 mpg with the manual 'box and 30/40 with the automatic.
Mazda also offers a larger 2.5-liter inline-four in the 3, and while a six-speed automatic will be the only transmission available with this engine at launch, the automaker has confirmed that a manual is coming shortly. With the 6AT and 2.5, the Mazda3 sedan is rated at 28/39 mpg, or 29/40 with the company's i-Eloop regenerative braking system. Hatchback models shrink those numbers to 28/37 and 29/39 mpg, with and without i-Eloop, respectively.

Mazda hard at work on Skyactiv 2 engine technology

As Mazda continues the current rollout of its still-new Skyactiv technology, the automaker is already looking at improving its family of engines for even better fuel economy and emissions reductions. Automotive News reports that with stricter fuel economy and emissions regulations planned for 2020 and 2025 in Europe, Mazda will likely release engines with next-generation Skyactiv 2 technology by the end of this decade, and Skyactiv 3 units just five years later.
The latter is expected to focus on improved engine cooling and lessening energy losses, but the big news in AN's report is that the next-gen Skyactiv 2 engines will use Homogeneous Charge Compression Ignition, or HCCI. This type of ignition is very similar to how a diesel engine operates (with high compression and using the compression stroke for fuel combustion rather than spark plugs), a method said to provide a cleaner and more efficient fuel burn - to the tune of a 30-percent improvement in fuel economy compared to current Skyactiv engines. Other automakers, including Hyundai, have already announced they are developing HCCI powerplants with similar technology and characteristics, so Mazda likely won't be a lone wolf here.
Equipped with HCCI technology, Mazda figures to be able to compete with larger automakers in terms of fuel economy and emissions without resorting to hybrid powertrains, continuously variable transmissions or automatics relying on more forward gears (eight or more) for optimal efficiency. Some of the challenges of HCCI, according to AN, include the need for better engine cooling, risk of misfire at high and low rpm and uneven engine performance based on fuel properties.