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Sky takes Mazda powertrains to the next level

Mazda's next-generation of powertrains, called Sky, will feature a variety of new technologies that company engineers say improve fuel efficiency by 20 percent. The Sky engines--Sky-G for the gasoline version, Sky-D for diesel--coupled with a Sky-Drive automatic transmission or a six-speed manual, were offered for test drives during a technology day in Berlin. The Sky-G engine we drove was a 2.0-liter inline-four that made 160 hp and 155 lb-ft of torque.

Driven: Mazda RX-8

The two most obvious elements of its unusual make-up are its rotary engine and rear-hinged rear doors with integral B-pillars. What became clear during our week with the RX-8 was how these two aspects of its design form the basis of many other unique qualities... Sports coupe and GT coupe The rotary engine of the RX-8 has a very distinct power delivery that is a defining part of the car's character, but it is also a very small lump of metal compared to a similarly powerful conventional reciprocating piston engine, enabling more of the car's overall length to be devoted to cabin space.

Five least-green vehicles

We are a generation seemingly obsessed with the environment, eager to cover our carbon footprints in any way possible--or at least give off a green vibe visible to our neighbors). And though many car buyers are jumping on the hybrid and electric bandwagons, the majority of us still crave brute-power cars and trucks. While being environmentally friendly is nice, there comes a time when you just have to be mean -- eco-mean, in this case.