Under § 80.101(d)(3), the refiner or importer must include in its compliance calculations the volume of gasoline blending stock that was used in the production of conventional gasoline produced solely upon the addition of oxygenate, and not the volume of gasoline after the addition of the oxygenate.

However, under § 80.101(d)(4)(i), the refiner or importer should separately include in its compliance calculations the oxygen added by the refiner or importer. For gasoline produced downstream of the refinery or import facility, if all of the requirements of § 80.101(d)(4)(ii) are met, the refiner or importer may separately include in its compliance calculations the volume of oxygenate that was added to produce the gasoline downstream.(10/17/94)

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)