I have heard that APC's are efficient and if they are I wonder if we can or do use a little less throttle . If so we may use the same amount of fuel or even less?

As to the thrust measurement and the fish scale, I don't think its the last word on selecting a prop. I think it just give a good measurement on pulling power and a place to start.

It did help me get an idea as to the engine and prop I had being able to fly a heavy plane. I used the prop that pulled the most and it did very well, even with our field being small for big planes ( corn did not help ) I was able to pull it off with room to spare.

sticks