We know that gas additives (TCW3, Lucas, PIB) change the way gasoline burns (documented in my YouTube videos). Some people see small MPG improvement as well (i was not able to verify it in my already very efficient prius). I did clearly hear a difference in engine noise. I have no gismos to compare power, but did anyone noticed or measured anything, especially dealing with transient engine response? I know some people have accelerometers and such. BTW, I welcome any facts, but please don't post any uneducated opinions only (waste of space, time, and electricity).