I have a 60 gal tank in my '74 20cc w/ Suzuki DF140. I feel this is more than enough, in fact, 50 gals would be fine. I have completely filled mine once, we did over 50nm and came back with the gauge showing 3/4 tank. Most of my offshore trips average around 70nm and burn about 20 gals. I've done over 100nm without starting with a full tank.
Your fuel burn might be a little higher than mine, but I don't think you need 80 gals.
Just my 2 cents.
Lloyd
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1973 Seacraft 20' SF "Sea Dog"
1988 Tracker/Seacraft 23' WA "Salty Dog"
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