Known as 'hypermiling', the method can double gas mileage.

这种方法被称为“超速行驶”，它可以使加油里程增加一倍。

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The gas pistons enable the bed to double up as a computer table.

气体活塞可以把床铺折叠起来成为一张电脑桌。

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Capturing the resulting methane has a double benefit. As well as yielding energy, it also prevents what is a potent greenhouse gas from being released into the atmosphere.

收集发酵产生的沼气有两大益处：其一，能够获得能源；其二，能够阻止甲烷(一种强效温室气体)进入大气层。

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Can General Motors create a hybrid Hummer and exclaim that eight miles per gallon is "Double the gas mileage!"

FORBES: Magazine Article

The foreign tax credit was designed to prevent American companies, like those in the oil and natural gas industry, from being double taxed on foreign income so they can compete in the global marketplace.

ECONOMIST: President, pygmy or poodle?

They stepped on the gas to make more than double that in the next 24 balls as Gautam Gambhir (58) pulled Andrew Flintoff and Virender Sehwag (68) flogged Dimitri Mascarenhas over extra-cover for sixes.

BBC: England bow out with India defeat