There are lots more options.
First empty the boat of all unnecessary gear! Weight has a pretty significant impact on efficiency.
Next make sure the bottom is really cleaned and waxed, to reduce drag.
Then consider running with less fuel, plenty of options on Winnipesaukee to refuel when needed, rather than running around with 50 gals of fuel you dont need that day.
After that, engine work. Make sure the spark arrester is clean, if its dirty/clogged you will have a rich fuel mixture. Specialty intake manifold and carb can help, possibly swap to an EFI system, and make sure you have all your ignition items updated. Get the best quality plugs/wires/etc you can find.
Every item on its own doesnt make a huge difference, but in totality it is possible to have a noteworthy impact.
ATB/Good Luck
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