Need some help from all you boat motor heads. Have new power on my 86 Trophy 20ft 140 suzuki in place of the 125 force. What are your thoughts about the RPM. I am on my 3rd prop trying to plane under 4600 rpm. The top speed rpm 5900 is still ok, red line is 6200, but all the on line data is that 4000 gives the best mpg. The big question. Is it better to run this 4 stroke at higher rpm or pitch it up to bring the rpm down and bring the top end rpm to the lower range? What is best for the motor. Gas is still cheaper than a new motor. How long can I use the "I'm going out to test the prop"?