My '87 18' has a 25" transom and my rating decal says max hp is 200 hp.
That said, I have an Etec 90 hp, and I get a WOT speed of 35 mph properly trimmed, and I get 6.8 mpg average, with my cruise speed being about 21-22 mph inshore, and about 18-20 mph offshore. Instead of trim tabs, I run with a Hydro-Shield under my prop.
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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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