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Hi Wayne,
As you can imagine, many things can effect range so I'll tell you the worst range you are going to get. First, the undisputed rule. A typical 2 stroke carbureted outboard will burn 10% of its rated horsepower in gallons per hour at full throttle. So the 60 hp in normal condition will burn 6 gallons per hour at full throttle. It simply cannot burn more fuel than that. So I'll assume you can get about 32 mph out of your hull with the engine turning its max 5500 rpm will give you 5.5 mpg or a 64 mile range when you run out of gas. Now of course you're not going to run the engine this way so your mpg should be at least 10-15% better at reasonable cruise, say 4200-4400 rpm and 25 mph. So if you plan your trips based on the 10%|rated hp rule=gph you will never run out of fuel under normal circumstances.