Can refiners use the E300 and E200 conversion equations in lieu of re-graphing the distillation data?

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Refiners should use the most accurate means available to determine values for E200 and E300. If these parameters cannot be measured directly, they must be converted from distillation data via curve-fitting. Only if no distillation data exists can the conversion equations be used.(7/1/94)

This question and answer was posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (PDF)(333 pp, 18.17 MB, EPA420-R-03-009, July 2003, About PDF)