To amend the renewable fuel program under the Clean Air Act to account for small refinery exemptions in past calendar years, and for other purposes.

“(E) Accounting for full volume of exemptions for 2006 through 2018

“(i) Study of previous years—Not later than 30 days after the date of enactment of this subparagraph, the Administrator shall—

“(I) complete a study to determine, for each of calendar years 2006 through 2018, the overall reduction in the national quantity of renewable fuel that was sold or introduced in interstate commerce as a result of exemptions granted to small refineries under this paragraph; and

“(II) submit a report to the Congress containing the results of such study.

“(ii) Reallocating shortfalls to future years—The Administrator shall increase the applicable volume of renewable fuel required under paragraph (2) by adding the reductions found, pursuant to clause (i), to have occurred across calendar years 2006 through 2018, to the applicable volume required under paragraph (2) for future calendar years, beginning with calendar year 2019.”