Ethanol is imported on an undenatured basis. Do we assign the RINs to the denatured volume or the undenatured volume?

Denatured. See regulation Sections 80.1101(d)(3) and 80.1115(b)(2).

Question and Answer was originally posted at: Questions and Answers on the Renewable Fuel Standard Program (PDF) (55 pp, 221 K, EPA420-F-07-041a, August 2007, About PDF)