After having trouble with gas through the years, I too talked to as many Marine Mechanics as possible. Now the only gas I will put in my sled is Chevron. Medium grade or premium only. They say that the shelf life of gas is down to about 45 days. By using the higher octane it will help keep it stable longer.
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Remember always "Fish 4 Fun"
Puget Sound Anglers -Renton Chapter-
Co-Event Coordinator Salmon For Soldiers