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The factory rep I spoke to on the phone said that each PRI-G or PRI-D treament is good for one year.
He said add the recommended amount of PRI-G treatment to the gasoline storage tank after it had been sitting for a year, agitate it well, and you're good for another year.
I also had 300...
I've had good luck with this stuff when storing diesel and gasoline for long term...
PRI Advanced Fuel Treatments
and they claim the Pri-G has the ability to restore stale, unusable gasoline to a usable state.
HTH