Power drop at high rpm

[steplift20]

as you know the gas [ thanx to that m fkr pres bush] mis screwed up htey add ethenol to it and its messing up the boat motors just like your having its happening to me also
runs good than it bogs down
do you have a water seperator
iof you dont put one on
they say it should be 10 mirons but im not sure if thats a good idea
good luck