Just went out to the open ocean to sail and found that because of a lack of a good breeze I had to use my 8 hp outboard a lot. What I found was that it really sucked up the gas. I traveled approx. 20 miles and went through 7 gallons. Almost ran out! Only 3-4 miles per gallon. My hull speed is 7 knots. Is there a formula for sailboats on what kind of gas milage one can get? After all, their designed for sailing and not motoring.chris.