I have a 1989 Weekender 230 with...

[Sean65]

I have a 1989 Weekender 230 with a 5.7 Merc for an engine. Trying to find out what the fuel burn per hr is at 3400 rpm’s or 24 kts? Haven’t had it long enough before winter came. 

[Noble]

I usually go to BoatTest.com for that info. But I couldn't find your specific boat. Attached is for a 5.7L 250hp Mercruiser on a 27' express cruiser. But so many differences like weight and style and tank size will affect test results so don't use this as gospel - just an example guide.

[Javelin]

I have a 1990 22’ (23.5) CC w/ the same drive. I burn about 7-gallons per hour at 30 MPH