Gasoline Standards

Direct Final Rule: Modifications to Standards and Requirements for Reformulated and Conventional Gasoline Including Butane Blenders and Attest Engagements Additional Resources

Direct Final Rule (PDF) (29 pp, 233K, published December 15, 2005)

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Fact Sheet: EPA Issues a Direct Final Rule to Modify Certain Provisions of the Reformulated and Conventional Gasoline Regulations Including Provisions for Butane Blenders and Attest Engagements (PDF)(5 pp, 319 K, December 2005, EPA420-F-05-030)
Butane Blending Technical Analysis (PDF)(8 pp, 140 K, 4/28/03)