Agreed!
I have all of four vehicles to play with, though, with one being too young, as well as under warranty, to make a suitable test subject.
Since I am backyard (shade tree, maybe?) Bob, I like to try one thing a a time, to isolate any effect. All I can really measure is sound, feel and butt dino power, all subjective. The only objective tools at hand are measured oil consumption and fuel economy. Since I don't have anything now that uses enough oil to require top ups between changes, I have only fuel economy as an objective measure and the observed differences in fuel economy will likely never reach a statistically significant level.