Actual testing? On a dyno, under controlled conditions, where the only variables were the load and the fuel? No, purely subjective opinions that echoed what I posted the year before when I ordered the case of MaxLead 2000, and had likewise been posted the year before that. Not without value as observations, but not "actual testing".

Personally I'd rather shave off a little power to fully enjoy my car anywhere I might take it, rather than having to stay within driving distance of a particular filling station.