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There are really only two areas you could look at.
The first is engine efficiency.
The second is your hydro-dynamic drag.
Both are complex.
I prefer sailboats but if you want to optimize on the water fuel economy, you have to design from the water up.
Foils that lift the hull out of the water reduce hydro-dynamic drag tremendously. Then, with reduced drag, you can outline an engine design that minimizes fuel use at that reduced drag.
If speeds get high enough, then you can start down the road of reducing your aerodynamic drag.
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