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**Summary of Responses to Comments Regarding Deta iled Edits of the Proposed Fuel**  **Regulations in the Tier 3 NPRM** The following table contains our responses to detailed comments on the proposed amendments to the fuel regulations in 40 CFR Parts 79 and 80 that were contained in the Tier 3 NPRM. Comment EPA Response/Action § 79.5: Improper u se of the phrase “of this section” Regulatory text amended to address comment 40 CFR 80: Discontinue toxics calculation and reporting for blendstocks for butane and TGP. Reduce sampling and testing for blendstocks (T50, T90, E200, and E300) We are not making the requested changes as discussed in Section VI.A. of the preamble. We may consider whether additional changes in the context of a broader regulatory

streamlining rulemaking in the future. § 80.2: Broaden definition of NGL used as an ethanol denaturant and as a blendstock for E51 - 83 Regulatory text amended to address comment with respect to NGL used as an ethanol denaturant. Deferring finalizing standards for E51 - 83 including the use of NGL as an E51 - 83 blendstock § 80.2(cccc): Amend E51 - 83 definition Deferring finalizing standards for E51 - 83 § 80.65(f)(3)(iii)(A): Amend text regarding reporting requirements Regulatory text amended to address comment § 8 0.75: Amend text regarding reporting requirements Regulatory text amended to address comments § 80.75: Extended deadline for attest engagements We do not believe that it is necessary to extend the deadline as suggested in the comments, as discussed in Sec tion VI .A.1.b. of the preamble to the final rule .2

Comment EPA Response/Action § 80.82: Amend requirements regarding butane quality

records Deferring making suggested change to allow additional consideration § 80.1347: Change the words “at th e refinery” to “by

the refiner” regarding b enzene sampling Deferring making suggested change to allow additional consideration § 80.1601(a)(4): Provide clarity regarding the a

pplicability

of requirements to E16 - 50 Deferring finalizing standards for E16 - 50 § 80.1601(b)(2): Provide clarity regarding a pplicability

of Subpart O requirements to E16 - 50 and E50 - E83 sold in California Deferring finalizing standards for E16 - 50 and E51 - 83 § 80.1603(d)(3)(i): Clarify requirements regarding the reporting of conventional gasoline and CBOB volumes We believe that regulations as amended are clear. § 80.1608: Provide clarity regarding the e ffective date for E51 - 83 requirements Deferring finalizing standards for E51 - 83 § 80.1608(b)(2): Amend b enzene specifications for E51 - 83 Deferring finalizing standards for E51 - 83 § 80.1608(b)(4): Correct error regarding the RVP requirements for E51 - 83 Deferring finalizing standards for E51 - 83 § 80.1608(c)(3): Amend b enzene requirements for E51 - 83 Deferring finalizing standards for E51 - 83 § 80.1610: Amend requirements regarding the d emonstration of compliance with the requirements for denatured fuel ethanol These comments are addressed in the context of responding to comments in chapter 5.3 of the Summary and Anal ys is of Comments document3

Comment EPA Response/Action § 80.1611: Provide clarity regarding the e ffective date for E51 - 83 requirements Deferring finalizing standards for E51 - 83 § 80.1611(a)(b): Amend requirements regarding the l imitation on blendstocks used in E51 - 83 Deferring finalizing standards for E51 - 83 § 80.1612(b): Amend p rohibition on use of E51 - 83 made with NGL for use on making E16 - 50 Deferring finalizing standards for E16 - 50 and E51 - 83 § 80.1615(a): A llow butane blenders and transmix processors to generate credits We do not believe that is necessary or appropri ate for butane blenders and transmix processors to generate credits § 80.1616(a): Change date until earl y credits are valid until March 31, 2020 Regulatory text amended to address comment § 80.1622: Extend application for small refiner/refinery

status until June 31, 2014 The application was extended until January 1, 2015 § 80.1632: Amend benzene requirements for E51 - 83 Deferring finalizing standards for E51 - 83 § 80.1650(b)(1): Change regi stration date to June 30, 2014, The registration date for refiners and importers has been set at December 1, 2016. § 80.1651: Amend Product transfer document requirements These comments are addressed in the context of responding to comments in chapter 5. 3 of the Summary and Anal ys is of Comments document that accompanies the Tier 3 final rule § 80.1652: Amend Product transfer document requirements These comments are addressed in the context of responding to comments in chapter 5.3 of the Summary and Anal ysis of Comments document4

Comment EPA Response/Action § 80.1652(a)(7(iv): Clarify how identification of test method should be reported EPA will provide guidance on how reporting forms should be filled out § 80.1653” Amend Product transfer document requirements These comments are addressed in the context of responding to comments in chapter 5.3 of the Summary and Anal ys is of Comments document § 80.1662(a)(5): Amend branded refiner/importer liability

regarding E16 - 50 and E51 - 83 violations Deferring finalizing standards for E16 - 50 and E51 - 83 § 80.1615(c): Amend Calculation of credits Regulatory text amended to address co mment § 80.1656: Provide exemption for aviation and racing gasoline The exemption for aviation and racing gasoline is address in 80.1601 § 80.1667: Amend regulations re attest engagements Regulatory text amended to address comment Comments on regulatory

sections regarding performance based testing These comments are addressed in chapter 6.1.2. of the Summary

and Anal ys is of Comments document that accompanies the Tier 3 final rule