The Mazda Sky D diesel and Sky G gasoline engines are meant to bring "everlasting blue sky" to oversee "sustainable Zoom-Zoom." Both utilize low-friction engine blocks, direct injection and piezo-electric injectors. The Sky G is fitted with a "highly functional variable valve timing mechanism," and the Sky D gets a 2-stage turbocharger besides.
Together with technologies such as the Sky Drive 6-speed transmission, i-stop, regenerative braking and lighter vehicles, these lumps will form the core of Mazda's goal of a 30% increase in fuel economy in the coming years. You can read more about them after the jump, and check them out in the gallery of high-res photos below.