I don't recall anyone saying they are running a Yammi 150-4, but you can go on the Yamaha web site and look at their "Performance Bulletins". Just find a boat with a similar hull and weight and you should get a pretty good idea of what it will do on a V.
http://www.yamaha-motor.com/outboard.../perfbull.aspx
By the way, my Johnson 140 4-stroke gets 5 mpg and gives a top speed of 40 mph, I would think that the yammi 150 would do a little better on speed and maybe close on mpg.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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