May batch numbers be used to identify petroleum products other than gasoline or gasoline blendstocks thereby causing gaps in the batch numbering sequence?

Yes. (7/1/94)

This question and answer was originally 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)