Don’t you think your interpretation of “performance” is rather narrow minded?
if you compared the two fuels side by side in similar cars, and one drove farther than the other…its pretty obvious that performance is being measured by mileage…
if you compared the two fuels side by side in similar engines over the course of a life time (exaggerated example)… for the sake of comparing which fuel preserved the integrity of fuel related components… again, I think it’s clear that performance is being measured by conservation and not “go faster” factor.
performance can be measured by many things… and since most of the above discussion was centered around fuel mileage and saving a buck or two for the daily driver…I’m not sure why you assumed this was all about going faster.