Þú hefur eflaust gúgglað þetta líka, en þetta virðast flestir segja:
From Shell, BP and Valero: The way gasoline is now mandated to be made and formulated, they only store it for approx. 25 to 40 days MAXIMUM.
Without adding what is known as "fuel stabilizers", and based upon the knowledge furnished by those within the oil industry, I would not store gas any longer than about 60 days. Also, those fuel stabilizers MAY NOT be well suited for a particular engine, such as your car(s). Each engine is different and no one knows for sure, except the engineers that designed that engine and its fuel delivery system.
The "fuel delivery system" means the delivery of fuel all the way from the tank to the combustion chamber. When in doubt, read your Owner's Manual and/or call the manufacturer.
Hér er einnig aðeins lengra svar og meira rökstutt:
http://www.avianflutalk.com/forum_posts.asp?TID=21082