Clarify that the proper version of the Complex Model that is to be used with an augmentation is the version that was in effect at the time the augmentation was approved. The preamble and regulations are inconsistent on this issue, and confusion arises in

See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help.

The proper version of the Complex Model that is to be used with an augmentation is the version that was in effect at the time the augmentation was approved.(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)