Re: \"Ideal\" power for a 20' '87 Superfisherman?
Ideal power depends on money. If you've got 30 grand to throw away, you can get a 200 hp multifuel outboard, including diesel.
If you're on a tight budget, I really like 2.0 liter Mercury V6 outboards, which can be built to reach 175-180 hp, and still be very reliable, and push your boat at 3.3 to 3.5 mpg.
If operating expenses are paramount AND you can afford the payments on a new motor, a 115 or 150 hp Optimax or Etec, or 140 hp Suzuki/Johnson will all get you about 5 mpg, with the 115 Optimax being the most economical by less than 1% over the Etec, while the Etec costs less to purchase.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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