<VV> How stable is Sta-Bil?

[J R Read_HML]

Or any other gasoline stabilizer for that matter?

Does anyone have a clue as to the shelf life of this stuff?  A partially 
used (cap on of course) bottle will last how long - especially considering 
that it is located in an unheated garage in the Midwest.  Is it still good 
after 3 or 4 years?  longer?

Any chemists on VV who might be able to come up with an estimated shelf 
life?

Later, JR