It will be a while until my tank empties. But, I can say absolutely for sure that there is no detonation/pinging or sluggishness whatsoever. There is also a very definite increase in power...less lag time from stepping on the gas...response is quicker. Perhaps with the RXP Generation II additive with a slightly leaner mixture is now optimized for the best combustion. I don't know and it may be in my imagination but I like to think I'm fairly observant. I will definitely post results good or bad at the end of the tank and over a few tanks, I'm sure I'll see the real picture.