I feel the same improvements whenever I change my britches.
While it is possible for some oils to yield a "quieter" running engine, as long as the viscosity didn't change due to the change, I'm not sure a rear-end dyno could detect any miniscule beneficial effects.
I recall pumping up the tire on my bike as a kid. I felt as if I were riding maybe 8 inches higher off the road surface after pumping it up. Then, I looked down, and it was flat as a flitter.
Beware the placebo effect.
That said, PP performs exceedingly well in my vehicles, as backed up by UOA, easily going twice the manufacturer's recommended longest OCI's. So, I use it!
