I suppose if the bottom of your boat is not crapped up that could only help, maybe negligible, what about trim tabs...is bow down plowing going to hurt it
I have never checked mine, 350block/260hp/24'deepV. I also don't keep the tank full. Unlike nobozo I am at half full or less most of the time, maybe that helps, not sure, less weight, but doing it that way doesn't help me calculate what I use, no fancy electronics on board.
with my car I am all over that stat, but never checked it with the boat, don't think I wanted to know the answer