Bryan Manning								8/29/2007

U.S. EPA Office of Transportation and Air 					

Quality Assessment and Standards Division

2000 Traverwood Drive

Ann Arbor, MI 48105

Bryan,

Attached please find an executive summary of Coordinating Research
Council work dated 2003, relating to the efforts to find an unleaded
alternative aviation fuel to replace the current leaded aviation
gasoline (100LL).  Also attached is a presentation given to CRC in 2006
covering recent testing results.  The CRC members have agreed to release
this information, at your request, for inclusion in the public record.

Please note that the Coordinating Research Council (CRC) is a non-profit
organization that directs, through committee action, engineering and
environmental studies on the interaction between equipment and petroleum
products.  The CRC is not involved in any way in regulation, which
remains a governmental responsibility;  nor is CRC involved in the
development of hardware or petroleum products, which remains the
responsibility of private industry.  The entire mission statement of CRC
can be found on their website   HYPERLINK "http://www.crcao.org" 
www.crcao.org , by selecting the link “about CRC”.

The CRC Aviation Gasolines Committee continues to direct research in the
area of unleaded aviation gasolines and has made significant progress
since the attached write-ups were completed.  In particular, the
detonation testing of 47 unleaded fuel blends in a full-scale engine
from the second level of matrix fuels has been completed.  Detonation
performance differences from recent full-scale engine tests between
leaded and unleaded fuels of equivalent octane have also been
documented.  Furthermore, plans are being pursued to direct research
regarding engine modifications to reduce engine octane requirement.

Sincerely,

Dave Atwood

Vice Chairman, Aviation Gasolines Committee

(609) 485-4986

Dave.Atwood@faa.gov

