Mazda's engine breakthrough promises big fuel efficiency gains | Engadget

will be available in 2019 and promises up to 20-30% more engine efficiency than the current SkyActiv-G, and up to 45% more than Mazda's 2008 petrol engine
The SkyActiv-X will ignite the air-fuel mix spark-free through compression, like a diesel engine. This, according to the Japanese manufacturer, combines the advantages of petrol and diesel engines to achieve "outstanding" environmental and power performance.