That's a great article, and it confirms what I've thought for a long time. 200 hp is simply better. (Think of a house air conditioner.. too small a window unit and it has to run all the time. Make it bigger and it works less to deliver the same cooling.... in other words, it's more economical) The same with a 200 vs a 150 on our size boats.
At any rate. it was a good article and I thank you BigShrimpin for finding it. I just wish they mentioned what pitch prop they were using in their tests. That would have helped a lot.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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