My opinion. 100 gallon is more than enough for the new engines with their improved mileage. I would put it as far forward as it will go. My 144 gal sticks back in to the bilge area and it's right against the front "fish box". If you go with a 100 gal you could go with a fresh water tank, say 20 -25 gal behind the gas tank and still not be in the bilge area.
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