My understanding of fuel use reduction has to do with rpm at cruising speed. Let's just say 4000 rpm. That's a pretty average running speed for any modern outboard on a salt water application. Most the time the cruising speed when propped right is anywhere between 26 and 32 mph based on boat size, power yadi yadi ya.. Boats propped right for their intended hull speed , with correct engine height, generally don't have much prop slip while on plane. Especially when running a 4 blade. Most salt water application do for our environment. So that being said, my question and or theory is this. Does this prop allow you to move up a pitch? So that your cruising rpm is down by a considerable amount? Enough to gain a noticeable fuel economy? The pitch might actually work like a variable pitch prop in a way.
If the answer is mostly yes it reduces your rpm at cruising speed, then your putting your engine in a lower power curve. Outboards are usually rated their HP at 5 grand. With each engine class in its vintage has its own technologies throughout the years and are all a bit different on a dyno graph.. is that a good thing? Very interesting and I wanna try one