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Originally Posted by YeA 20sF
I wish I knew my fuel economy I have a Merc XRi EFI 150 with a 19p 3 blade prop on my 20 my rpms dont pass 5100 if i really gun the throttle. With a full load i see speeds of about mid 30's mph on the gps but my fuel burn is just guess work at this point. I need better electronics i guess to help figure it out so I really cant help with exact numbers
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150 XRi is a 2.5L. You need to prop the boat so that the motors turns 5800 WOT with average load. I suspect you can improve your performance quite a bit by raising the motor a few holes and finding the right prop. 5100rpm with a 19P is lugging the motor down too much and you'll get crappy fuel economy and performance. I could crack 40mph on my 20 MA with a 150xr2 and that's a 2.0L motor. The super long 150 tuner limits the top end on that motor a bit, but you should be low to mid 40's with a 2.5L 150.