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Under section 211 of the Clean Air Act, the Environmental Protection Agency (EPA) is required to set renewable fuel percentage standards every year. This action establishes the annual percentage standards for cellulosic biofuel, biomass-based diesel, advanced biofuel, and total renewable fuel that apply to gasoline and diesel transportation fuel produced or imported in the year 2020. Relying on statutory waiver authority that is available when the projected cellulosic biofuel production volume is less than the applicable volume specified in the statute, EPA is establishing volume requirements for cellulosic biofuel, advanced biofuel, and total renewable fuel that are below the statutory volume targets. We are also establishing the applicable volume of biomass-based diesel for 2021. This rule also addresses the 2016 total renewable fuel RVO, which was remanded to EPA for further consideration by the D.C. Circuit court after the court vacated EPA's use of the general waiver authority in 2016. Finally, this rulemaking includes several regulatory amendments designed to provide clarity and increase opportunities for renewable fuel production.