A standard formula for an outboard is hp divided by ten or 8 hp divided by
equals .8 gallons per hour at 3/4 speed 5 kts.  Does this seem about right? 
That would give a five gallon tank about 25 km plus.



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Christopher P. Cowie      

4400 MacArthur Blvd, NW
Suite 300
Washington, DC 20007
202.342.2711 ex.204 ? 202.342.2691 fax ? 202.270.1470 mobile
[ccowie at cowieassociates.com]

 

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