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Old 09-28-2020, 05:18 PM
Senior Member
Join Date: Aug 2012
Posts: 8,603
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Your gph sounds ok, but 20mph from 15hp on a 14ft boat sounds ambitious - 10hp (2 stroke) on a 10ft boat gives me 19mph which equates to about 19mpg - even though it’s a two stroke, it drinks by the thimble full.
BTW, you could offer me a brand new four stroke to replace that little engine (Tohatsu) and I wouldn’t take it.