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I have a 2007 Trophy 2352WA with a Mercruiser 260 hp 5.0l MPI with Alpha-1 1.62 gears and a stock 3 blade aluminum 14.5x19p prop and trim tabs. I get 40 mph @ 5000 rpm WOT with 1.8 mpg. I tested a Turning point 4 blade aluminum 14x19p that got 36 mph @ 4000 rpm WOT with 2.2 mpg. I would like a 4...