Hey Therm
My 1991 V-20 inbd with the 350cu in (carb) gets anywhere between 3.3.- 3.8 mpg and that's cruising at 3,000 rpm (30-33 mph).
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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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