Due in 2019, the Skyactiv-X engine family will replace today’s Skyactiv-G units. It could make Mazda the first carmaker to use compression ignition on a production car.

Gasoline engines typically ignite fuel using a spark within the cylinder. Compression ignition works similarly to a diesel engine; fuel is heated to the point of combustion by being compressed within the cylinders.

Skyactiv-X uses compression and spark ignition, and the engines’ performance is boosted by a supercharger. Mazda is claiming a 10-30% increase in torque and 20-30% increase in engine efficiency over the current Skyactiv-G petrols, but said it also can also equal or exceed the current Skyactiv-D diesels for fuel efficiency.

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