cc: G. McCarthy 

C. Grundler 

P. Machiele

DAflY READING FILE 

Robert Perciasepe 

Acting Administrator 

U.S. Environmental Protection Agency 

Mail code: 4101M 

Ariel Rios Building 

1200 Pennsylvania Avenue, N.W. 

Washington, DC 20460

Richard Moskowitz	American 

General Counsel	 Fuel & Petrochemical 

Manufacturers 

1667 K Street, NW 

Suite 700 

Washington, DC 

20000 

202.457.0480 office 

202552.8457 direct 

202 457.0486 fax 

Rmoskowtzafprn.org

Subject: Request for an Extension of the Public Comment Period on EPA's Proposal for Tier 3 

EPA-HQ-OAR-201 1-0 135 

Dear Mr. Perciasepe: 

As you know, the Agency released a proposal for Tier 3 motor vehicle and fuel standards 

on March 29, 2013. This proposal has not yet been published in the Federal Register. 

In a hearing notice published in the Federal Register on April 8, 2013, EPA announced 

that the public comment period would end on June 13, 2013. The length of this comment period 

is inadequate for a broad technical rulemaking such as this, especially one that includes diverse 

topics of vehicle emissions standards, fuel standards and the distinct unrelated issue of 

Performance Based Measurement System. Each of these issues requires different technical 

expertise to analyze. 

The docket was opened on April 15. There are over 600 documents now in the Tier 3 

docket in the Supporting and Related Material category. It is virtually impossible to review and 

analyze this volume of supporting technical information in the time allotted for public comment. 

Accordingly, we request additional time to prepare informed comments on the proposal. 

AFPM requests that the public comment period be extended to 90 days after publication 

of the proposal in the Federal Register. 

Richard S. Moskowitz 
Delivery Address Bar Code 

TRK# 7995 6968 4125 

WOl

MON -22 APR 3:OOP 

STANDARD OVERNIGHT 

Ship Date: 19APR13 

ActWgt 02 LB 

CAD: 4458810i1NET3370 

From: (202) 457-0480	Origin ID: BZSA 

Richard Moskowils, General Counsel 

AFPM 

1667 KStreet NW 

Suite 700 

Washington, DC 20006

Jt3i1iX72l 

SHIP TO: 2O2) 564-4711	 BILL SENDER 

Acting Administrator Bob Perciasepe 

U.S. Environmental Proctection Agen 

Ariel Rios Building (AR), 4101M 

1200 Pennsylvania Avenue, N.W. 

Washington, DC 20460

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