If propylene glycol is an "antifreeze", couldn't it be added to bioD in winter?  Or am I showing my naivity? ;)

>>Renewable Alternatives, has developed a process for converting glycerin,
>>a byproduct of the biodiesel production process, into propylene glycol.
>>Propylene glycol can be used as nontoxic antifreeze for automobiles.

--
-Sir Woody Hackswell
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