fuel tank replacement size??

[Sspence01]

I am having to replace the fuel tank on my 1991 trophy 2502 wa it has two 200hp mariner 2stroke outboards. the original tank is 190 gallon as this boat was made for offshore fishing. I generally go near shore usually not too far from the launch. my question is would a 80 gallon tank be big enough or should I stick to the same size

 

[dingbat]

Twin 200 carbs get roughly 1 mpg at cruise

Using the 30/30/30 rule a 80 gallon tanks will give you roughly a 27 mile range. Cut that in half if it’s roughp