thanks for the info ..I went in the suwannee today and tried again ..two fat guys and half fuel..No sinkers..At wot 58 rmps ran 38 mph..trimed to 63 rpm put no real increase in speed....I ffelt that all things considered it really does a great job...I ran about 40 miles and used approx 6gal fuel.. I added the fuel and noted the movement of the gage needle and the position and the end. no real science.....I have had six different boats and still looking for the right one....I have had the same wife 48 years..now there might be the connection...