hi Jack,
i use a suzuki 6hp two stroke for coastal work, probably a bit big really - i used to use it on a 23' hunter sonata...so it was the only one i had!
so i can run it on 1/4 to 1/2 throttle most of the time, which makes it economical and quieter.
however, if the wind and tide get up, there's plenty in reserve.
austin