Help with propellers for a intrepid 377

[intrepid2dev]

I own a 377 intrepid with 3 suzuki DF300 engines. Currently I have 3 propellers with three blades (pitch 20) these are the original props that came with the engines. Currently the fuel efficiency is very bad and also I dont have that much top speed. Another problem that I have is that I want to change from a solid hub propeller to a interchangeable hub propeller. Can anyone recommend a specific propeller and also tell me if I can combine a 4 blade propeller in the center engine and 3 blade propellers for the right and left engine. Will these improve my fuel efficiency and my top speed?

Thanks

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