What size Four Stroke would be best???

[Rodhammerr]

Hello...I have a Pro-Line 2550 offshore boat, dry weight is 6000 lb. I'm currently running twin 200hp Johnsons but planning on getting twin Yamaha's before next spring...the fuel mileage is killing me!!! I currently only get about .5 to .86 MPG at best. I need some help determining what range in HP would work. I wont to achieve the best fuel mileage possible of course but don't want to spend thousands to find out that I don't have enough HP to push the boat. I want to be able to run 28 to 30 mph at cruising speed. Can I achieve this with twin 150hp and if so would they have better fuel mileage than the 200hp??? Any suggestions....

[robert graham]

You might go to: Yamaha Outboard Performance Bulletins, to try to get an idea regarding fuel flows, MPG, GPH, MPH....Outboards generally run A WOT GPH flow rate more or less equal to 10 percent of the motor's rated HP....in your case 50 GPH at WOT....good luck!

[robert graham]

That would be 40 GPH at WOT for your twin 200's...not 250's....my mistake...

[Rodhammerr]

Thanks...I check it out and it shows the twin 200hp will get better fuel gph than the 150's. Guess I will start looking for twin 200XCA...Thanks again

[almetelo]

Have a look on attachment.
Have the test of the F200 4 cylinders.

Comparing with previous V6 at WOT consumption is a "little more" about 1gl/h

So far no other fuel consumption tests with the new F200 that I know.