That's a 2.5L block, so fuel economy is going to be more than a 2.0L 150. Prop the boat to turn 5800 and you should see close to 3mpg. I ran a 2.4L 175, 200 and 225 merc on an 18 and 20. Make sure motor height is perfect, find where you blow out and lower it one hole. Definitely put on tabs. Start with a 17P prop and tweak from there.
Last edited by Bigshrimpin; 02-27-2012 at 11:16 PM.
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