I think that by using a simple calculation, you are only able to determine the optimal, or maybe average fuel consumption. There are so many variables to consider that it would be tough to get a "real world" number. Things such as weight of the boat, # of passengers on board, weight of any cargo, wind conditions, lake conditions etc. would affect the fuel consumption.
To get a true average fuel consumption, take several trips starting with a full tank of fuel. Fill up when you get back. That way you can determine how much fuel you used.
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Getting ready for winter!
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