The EPA is taking direct final rulemaking action to approve the State of Texas' Clean Fuel Fleet (CFF) substitute plan, incorporating it into the State Implementation Plan (SIP) under the Federal Clean Air Act (CAA). The State's CFF Substitute Plan is addressed in the SIP revision submitted on August 27 1998, and supplemented with additional technical information in a letter to the EPA dated November 17, 2000, by the State of Texas for the purpose of establishing a substitute CFF program.