Sorry for the tardy response, winter here, the boat is sort of out of sight, out of mind.
I don't know how far it will go, but from the little is has drank so far, I can see the 4 stroke will go much further than my old 2 stroke. When I was using the motor, Cape Cod or somewhere big I used to keep a 1.5 gal jug in the boat. I may not have to anymore...