EPA is taking direct final action to clarify, correct, amend, and revise certain provisions of the Tier 2/Gasoline Sulfur regulations (February 10, 2000), hereinafter referred to as the Tier 2 rule. First, today's action corrects typographical errors and makes other minor revisions to clarify the regulations governing compliance with the Tier 2 rule. Second, it modifies the effective date of the regulatory butane test method for determining the sulfur content of butane, a gasoline blendstock. Third, today's rule modifies the Geographic Phase-in Area (GPA) program by replacing the variable standard for GPA gasoline with a flat average standard of 150 ppm sulfur. Fourth, it allows an approved small refiner, under limited circumstances, to seek a temporary adjustment to its interim small refiner per-gallon cap standard. Finally, it amends certain provisions of the small refiner and Averaging, Banking, and Trading (ABT) programs as well as compliance and enforcement provisions to assist regulated entities with program implementation and compliance.