September 30, 2010

MEMORANDUM				

SUBJECT:	CH4 Data from 2010 and 2011 Heavy-Duty Vehicle Certification
Tests 

FROM:	Antonio Fernandez, Engineer

Assessment and Standards Division

TO:		Docket EPA-HQ-OAR-2010-0162

This memorandum contains the results of 9 tests of various
manufacturers’ heavy-duty certified models in 2010 and 2011.  They
were all tested over the FTP city and highway fuel economy cycles.  Two
of the tests represent gasoline fueled vehicles while the remaining
seven represent diesel vehicles.  The emission levels reflect the
composite result with the city cycle accounting for 55% and the highway
accounting for 45% of the result.  

Eight of the tests resulted in levels at or below half of the proposed
cap standard of 0.05 g/mile. 

Only one of the vehicles, a diesel, exceeded the proposed cap of 0.05
g/mile.  Since methane is not currently a regulated emission in
heavy-duty, there has been little effort at controlling methane.  We
believe that with some concentrated effort by the manufacturer at
controlling the methane emissions, this diesel vehicle should be able to
meet the proposed methane cap.

