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A 10 to 12 gallon tank will weigh, when full, between 70 amd 84 pounds and take up too much space in a Sport 13. Do you really need the range such a large tank offers?

I use a six gallon tank and it serves well. I can remove the tank and take it with me when I buy fuel at the "no ethanol" gas station without fear of a hernia. It also fits well in the 13. and can be partially placed under the thwarts. If you must have greater capacity consider two 6 gallon tanks for easier handling and storage on the boat.