In general, refiners, importers, and oxygenate blenders may not certify fuel at an oxygen level above the maximum cap of 2.7% by weight for VOC controlled RFG, or 3.5% by weight for non-VOC controlled RFG. The maximum oxygen content for RFG does not vary according to oxygenate type, nor will blending allowances be permitted.

This may be modified by state petition under § 80.41(g). Also, oxygen content must otherwise be federally permissible. More specifically, under the substantially similar interpretive rule (56 FR 5352, February 11, 1991), oxygen content is limited to 2.7% by weight unless waived under section 211(f) of the Clean Air Act.(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)