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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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As oil prices rise, ethanol starts to be competitive again (as a rule of thumb, ethanol is profitable when petrol costs $3 a gallon in America, a level it has just reached in California).

石油价格上涨，乙醇竞争力再显（在拇指原则中，当美国石油价格达到3美元一加仑时，乙醇就有利可图，现在加州的油价刚好达到这个水平）。

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Last year House Republicans proposed cutting spending to the level of the shrinking petrol-tax receipts.

ECONOMIST: How not to fund infrastructure

The rising cost of petrol pushed the headline inflation rate in the UK up to 3.3% in June - its highest level for nearly two years.

BBC: Inflation pushes UK wages up