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| | Crude Oil Imports From Persian Gulf 2004 |
 | | It should be noted that several factors influence the source of a company's crude oil imports. |
 | | While, in general, crude oil is fungible, i.e., one crude oil can be substituted for another, many refineries are optimized by refining crude oil with specific qualities (e.g., the API gravity, the amount of sulfur in the crude oil, etc.). |
 | | Also, depending on the global crude oil market condition at the time, the price difference between heavy and light crude oils varies, thus changing the economic dynamics for different refineries. |
| www.eia.doe.gov /pub/oil_gas/petroleum/data_publications/company_level_imports/current/summary2004.html (160 words) |
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