UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2000 TRAVERWOOD DRIVE

ANN ARBOR, MI  48105-2498

									     OFFICE OF

									AIR AND RADIATION

July 2016

MEMORANDUM

SUBJECT:  Summary of Comments on Vocational Vehicle Baselines

FROM:  L. Steele and G. Mitchell, EPA-OTAQ, Assessment and Standards
Division

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 summarizes significant comments submitted by vocational
vehicle manufacturers regarding configurations of current product
offerings with respect to tire sizes, axle ratios, and other driveline
specifications that influence the ratio of engine speed to vehicle
speed, sometimes referred to as N/V.  This is not an exhaustive list. 
Other comments are found elsewhere in the docket.  However these were
particularly influential with respect to the agencies’ final selection
of light heavy-duty and medium heavy-duty diesel and gasoline baseline
configurations.

Data were received from several vocational vehicle manufacturers, as
noted below:   

Daimler Truck North America (DTNA) email received on 05/18/2016 with
attachments MHD_Baseline_Adjustments_20160518.xlsx and
MHD_Baseline_Adjustment_20160518.pptx containing sales volumes of
particular rear axle ratio, wheel radius and engine speed at 65 mph for
MHD diesel and gasoline vehicles,

Navistar email received on 05/24/2016 as an email with attachment
CBI-Navistar class 6-7 baseline inf-052416.pdf containing sales volumes
of particular rear axle ratio, wheel radius and engine speed at 65 mph
for MHD diesel vehicles, 

The Ford Motor Company email received on 05/02/2016 as an email with
spreadsheet 2b-5 Ford Vocational Vehicle Axel Tires Combos.xlsx
containing sales volumes of particular rear axle ratio, wheel radius and
engine speed at 65 mph for LHD, MHD gasoline and diesel vehicles. 

These data points allowed the agencies to align our regulatory baseline
vehicle configurations used in GEM for Regional, Multipurpose, and Urban
vocational vehicle subcategories with real world production to better
represent the current fleet.     

