Every boat and motor combo will be different,hence you just have to test and tune.I was tempted to try Maximus on our 22' Mod VP Stoker,but they are pricey and i know that the yet to be released Pro ET four will be the ultimate all around wheel.I have heard of twins going to the five blades and increasing fuel efficincy substantially.I would ask over at www.screamandfly.com or www.byuboyz.com good luck