Autoblog

In order to qualify its new Mazda2/Demio for Japan's Green Tax exemptions, Mazda has developed a trick new 1.3L Miller-cycle powerplant that's naturally-aspirated, of all things. Normally a supercharger is required in a Miller-cycle engine, which makes Mazda's new mill particularly intriguing. It will be combined with Mazda's first CVT, and thanks to a 222 lb. diet, the new Demio is expected to return 54 mpg. In the press release after the jump, Mazda makes a big deal about how efficient its new Miller engine is, but fails to mention how much power it makes. That's not surprising, since it's generally accepted that, compared to our traditional Otto-cycle engines, a Miller trades off power for increased efficiency (that's what the supercharger's usually for). With this new engine, however, Mazda further cements its reputation as an automaker with a penchant for alternative forms of internal combustion.

[Source: Mazda]