Here is something from another site:

you can view the performance bulletin on the yamaha website (yamaha.com) and it will show you the fuel consumption numbers for the F 150 on various boats. I looked at the numbers for the 18'Edgewater, which is similar to the Outrage 18. Here is just a short summary of the numbers.

rpm mph gph

3000 19.8 3.5
3500 26.5 5.1
4000 30.5 6.3
4500 35.5 8.3
5000 40.1 10.5
5500 45.7 14.3
5800 47.7 14.5


Obviously the boat will make a difference but from this chart, you could run at 3500 RPM for a total of 7 hours, going 185 miles, burning 36 gallons. That sounds like a lot of fuel for 184 miles, hooktender. What kind of boat are you running?

-Kaiser D.