Does a refiner have to use the same model at all of its refineries?

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If a refiner elects to aggregate its refineries under section 80.101(h), the same model (simple or complex) must be used at all refineries aggregated.(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)