The upgrading and refining facilities required to turn tar to oil cost billions of dollars, but the technology is tried and tested.

虽然需要将焦油砂转化为石油的升级和精炼设备成本高达数十亿美元，但这种技术仍在尝试和试验阶段。

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This article describe get paraffin oil refining technology by analysis and practice, cut down expenses consumption and reduce the production cost.

本文通过分析及实践，得到蜡油的精制技术，节约了大量的费用，降低了生产成本。

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In order to reduce the oil refining loss and production cost, some effective measures should be adopted.

在生产中应采取相应措施对其进行有效控制，从而达到减小油脂精炼损耗，降低油脂生产成本的目的。

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Historically, gasoline has cost more than diesel, which is a byproduct of the oil refining process.

FORBES: America's Oil Export Problem (Yes, Export)

Namely, beyond foregoing the obvious benefits that come from value-added processing such as refining (gasoline sells a lot more per gallon than the cost of a gallon of crude oil), we are incurring secondary costs that impact, in part, the very environment that radical environmentalists are trying to protect.

FORBES: The Hidden Price Of Radical Environmentalism