UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2000 TRAVERWOOD DRIVE

ANN ARBOR, MI  48105-2498

									     OFFICE OF

									AIR AND RADIATION

9/21/15

MEMORANDUM

SUBJECT: Transmission modeling and ranking with EMA

FROM: Houshun Zhang

TO:  Greenhouse Gas Emissions Standards and Fuel Efficiency Standards
for Medium- and

Heavy-Duty Engines and Vehicles - Phase 2 - Docket EPA-HQ-OAR-2014-0827

This memo documents communication on September 21, 2015 between
representatives of EMA and EPA to discuss the latest transmission model
modification proposed in the Phase 2 greenhouse gas and fuel efficiency
standards for heavy-duty vehicles notice of proposed rulemaking.  The
draft presentations are enclosed.

The discussions included new ranking of different transmissions for all
categories of vehicles under certifications. 

