SKYACTIV-X is in the works.

Mazda has unveiled their “Sustainable Zoom-Zoom 2030” vision for technology development by the year 2030.

Part of the vision is a next-generation engine called SKYACTIV-X, which will be introduced in 2019, and promises to be the world’s first commercial gasoline engine to use compression ignition. In other words, the fuel-air mixture ignites spontaneously when compressed by the piston, as opposed to being ignited by a spark.

Mazda says that this new proprietary combustion engine combines the advantages of gasoline and diesel engines to achieve outstanding environmental performance, power and acceleration performance.

With compression ignition and a supercharger Mazda says they can improve fuel economy and increase torque 10–30 percent over the current SKYACTIV-G gasoline engine.

In addition, compression ignition makes possible a super lean burn that improves engine efficiency up to 20–30 percent over the current SKYACTIV-G.