Demand shocks have come from sudden policy decisions to increase biofuel content in gasoline, for example.

需求的波动则来自于，比如说，增加生产生物燃料的政策。

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Heavy oil recovery rate can be increased and gasoline olefin hydrocarbon content can be decreased effectively by catalytic cracking operation parameters optimization.

通过优化催化裂化装置的操作参数可有效提高重油转化率和降低汽油烯烃含量。

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It has been used as an alternative of gasoline, improvers for octane number and oxygen content in gasoline.

在国外曾以汽油替代物、辛烷值改进剂和增加汽油氧含量三大作用添加到汽油中。

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Furthermore, Becker states, ethanol has a lower energy content than gasoline, so to meet the same energy demands, more gallons of ethanol would have to be produced.

NPR: Environmentalists Weigh In on Ethanol

Remember that ethanol has less energy content than gasoline.

FORBES: Field of Dreamers

There is simply nothing close to the energy content of gasoline or diesel fuel that allows you to fill up and take off and barely even have to think of any limit to your driving for the rest of the day even on a road trip.

FORBES: P.S. Did I Mention the Nissan Leaf is Boring?