The claiming of rejuvenating gas is, IMHO a bit far-fetched for I never heard of once gas started to deteriorate (gone for the better, lost it's essence,etc.), there will be chemicals that can revive the gas back to it's previous state.
I'm currently using 1,2,4-dimethylbenzene as stabilizers and it seems to be working fine in my 16 gals worth of naphtha gas currently under storage.