My 91 V20 with 350 I/O Volvo Penta dual prop at 3000 rpm puts me at 30 mph and 3.8 m/g.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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