Mazda Predicts Further 30-Percent Efficiency Gain For Next SkyActiv Engines

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While other manufacturers have turned to turbocharging and hybrids to boost fuel economy, Mazda has tried to squeeze the most it can out of unassisted internal-combustion engines. The company's SkyActiv line of efficiency-focused engines rely solely on tuning and some technical tricks to maximize gas mileage. SkyActiv engines have largely lived...