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A refinery does not calculate the cost of each product. It instead compares the total value of the product produced vs the cost of operations (including raw materials) and calculates a standard margin for all products. A refinery produces some byproducts that have little market value and the objective is to design a refiney that minimises the production of these low value products - i.e. invest in a reformer to upgrade low value products into high value blending components. The process to optimize a refinery is to run sophisticated models that simulate different economic conditions and different operating conditions to identify the conditions that maximize the profits.
The street price and the differentials between grades are a function of supply and demand in the local market.
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8 Porsche's to date, after many years of looking 1999 C2 Cab, Ocean Blue over tan Leather.
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