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Old as Dirt!
3,491 Posts
In Theory...

An in tune two stroke outboard burns about .6 to .8 pounds of fuel per horsepower per hour. On a plane, a 9.9hp outboard is probably using about 60% of its horsepower at 3/4's throttle or call it 5.94 hp. With this, the fuel burn is roughly 4.2 lbs/per hour. Gasoline with a 50:1 fuel;oil ratio weighs in at roughly 7lb per gallon so the burn rate is roughly .6 gal per hour.

Likely as not, one runs at less than full plane most of the time so I personally figure .75 gallon per hour. I.e. a 6 gallon tank last a bit over 8 hours assuming it is run bone dry. Figure 6-7 hours to be safe.


s/v HyLyte
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