randleman's numbers should be more realistic than mine.
I was basing my numbers on when my father had the V with a 140 crossflow. About 25-30mph, about 10-12 gallons per hour, 30 mile trip (2-3mpg).
By comparison the 4 strokes do have considerable more hp and better fuel efficiency than the older 2 strokes.
I would expect a 100 horse to be a constant strain and burn considerable more fuel than a 140 horse at the same speeds.
randlemans' numbers should translate to 5-6 gallons per hour.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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