Some thoughts that might help.
a. What condition is the prop in? Dents and nicks detract mileage.
b. Is it a stainless or aluminum prop, stainless is more rigid and may help a little.
c. Consider a prop with a steeper, higher numerical pitch. If you have a friend or two, try to borrow and test before making a buy somewhere.
d. Apologize if dumb answer, but what is state of engine tune, especially age and condition of the spark plugs?
e. Think about state of the top end, is it possibly carboned up? Might be time to try a little gas additive to break some of that up, but talk to a Johnson delaer to be sure what you get does conform to the motors makers spec/recommendations.
f. Hull condition? Is it due for a real good clean and 2-3 costs of wax? Does make a difference, slight but some.
g. Boat load, what can you do to reduce it. If the trip will be short one, then carry less fuel. 1 gallon of gasoline equals 5.8 to 6.5 lbs, maybe you have a 30 gallon tank? Carry just 10 gallons, saves 20 gallons and as much as 130 pounds. Again, idea has to geer to your boating situation.
Last, combo of all above, or at least the ones that apply.



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