Contrary to popular belief, CNG has a high octane level. 130, to be exact.
与流行的观点相反，CNG有很高的辛烷值水平。130年，要确切。
A higher octane level also allows for higher compression ratios and improved thermal efficiency.
一个高辛烷值水平也允许更高的压缩比和提高热效率。
With lead and MTBE additives now phased out, spiking petrol with a small amount of ethanol raises its octane level enough to prevent the engine from "knocking" under load.
目前铅和甲基叔丁基醚(MTBE)等添加剂被叫停，取而代之的是在汽油中添加少量酒精，这样提升辛烷水平能防止负载中引擎产生爆震。
With lead and MTBE additives now phased out, spiking petrol with a small amount of ethanol raises its octane level enough to prevent the engine from "knocking" under load.
目前铅和甲基叔丁基醚(MTBE)等添加剂被叫停，取而代之的是在汽油中添加少量酒精，这样提升辛烷水平能防止负载中引擎产生爆震。
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