[Vwdiesel] Help! How to winterize BioD ?

[Photo Bug]

This Sunday we will be filling my '03 Jetta TDI with a full tank of biodiesel made out of duck grease.  Shucks!  Thethermometer in N.W. Indiana has suddenly plummetted and biodiesel gells up when the temp drops into the 30's here.  What can I add to the biodiesel to keep it from gelling...even below zero???  
 
Thanks everyone!
Tom
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