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http://gas2.org/2017/01/16/next-mazd...no-sparkplugs/

Cranking up the compression ratio to around 18 to 1, the mixture of gasoline and air will explode on its own without the need of a spark. Mazda claims the result is 30% better fuel economy with lower emissions. According to Japanese trade journal Nikkei, the new HCCI engine will debut on the next generation Mazda3 sometime in 2018 before making its way to other vehicles in the Mazda lineup.

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