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Just a question to add another dimension to this discussion,

Does anyone know a site that provides a guide to what crude oil is actually used for (ie a breakdown with percentages)? The only reason I ask is that all discussions seem to look at oil usage for fuel, without taking into account the use by the petrochemical industries for plastics, rubber, etc.

Is it a significant percentage, and if so do they require higher or lower grades of oil than is usually refined for fuel usage?

Cheers in advance