115 gallons on my boat. I wouldn't go less than 90 if it were me. If you leave the boat in the water a couple of days it's nice to have the capacity. We go on vacation with the boat and fish every available day. It's nice to fill the tank and not have to fill it again for a couple of days.
With a single 4 stroke I don't think you need the capacity......it's just nice to have sometimes
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