To boost fuel efficiency more diesel engines are popping up, as well as improved four-cylinder engines.

为了提高燃料效率，更多的柴油发动机和改良的四缸发动机应运而生。

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This paper introduces the process of repairing hydraulic cylinder by using boring and rolling combined working technology, working quantity is steady and production efficiency is high in this method.

介绍了用镗滚压复合加工技术修复液压缸筒的过程，此法修复缸筒质量稳定，生产效率高。

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Cylinder rigid wake model has been adopted and the approximate treat in high efficiency. The results carried out for examples shows good agreement with experiments value.

采用圆柱刚性尾涡模型，并作高效近似处理，几个算例表明，计算值与实验值相符合。

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The 4-cylinder vans will get a combined fuel efficiency of 25 miles per gallon, nearly double what the Ford Crown Victoria gets.

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Now, it's true that amazing gains are being made in the efficiency of internal combustion engines, both gas and diesel: direct injection, cylinder deactivation, stop-start, eco-mode throttle mapping, to name a few of the recent applied technologies.

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