Contrary to popular belief, CNG has a high octanelevel. 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。
2
A higher octanelevel 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。
3
With lead and MTBE additives now phased out, spiking petrol with a small amount of ethanol raises its octanelevel enough to prevent the engine from "knocking" under load.