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The Evinrude gauge will display GPH, but I did not use that gauge only the 3100FF. I can note the differences next time i am out testing props. My GPS is always set to SMPH, I can't ever do the conversion from NMPH.

I struggle with a fuel issue as the cause, especially since the identical props gave simular results on my older Merc 150HP. If we were to look at fuel delivery as an issue then I would need to swap out my fuel tank, or at least replace the fuel pickup. All hoses from the tank to the water separator and from there to the engine were replaced when I installed the new outboard. To be sure, I could eliminate the water separator filter and run a new line from the tank pickup, directly to the engine. That would not eliminate the tank fuel pickup, but it's the best I could do.

My plan is to pickup a 19P Vensura and see how that prop plays out. Ultimately speed it not really what I am after, hole shot and mid range crusing are tops on my list. I will also retest the Laser II with solid plugs and see what that does for me.