Found it,

The fuel is piped without the Ethanol, then Ethanol is added at the terminal for those areas that use that particular oxygenate.

FWIW,

http://www.chevron.com/prodserv/fuels/bulletin/motorgas/ch4.shtml

TB

Tony Boner
Personal: 98cdw27@charter.net Work: tony.boner@sun.com
Saving the computer world from WinBloze as Unix/Solaris/Java Guru http://www.sun.com
1998 Contour SVT Pre-E1 618/6535 Born On Date: 4/30/1997
Now with Aussie Bar induced mild oversteer.