I used half a container in a half full tank in a Toyota MR2 and saw a difference the next day it cut an engine noise.
Regarding consumption, it is the 2nd day I still do not know if there is a difference, but I am satisfied with the smoothness and that it cut the noise.

I used it twice. Both times, when the low-quality fuel ran out, I added 90ml to the 18 liters of gasoline that my engine can hold with 100 octane gasoline.
As soon as the mixture ran out, the engine coughing and the explosions - sparks in the exhaust stopped.

I used it in a Peugeot 1007 without any problem, but mostly as a precaution, so I didn't expect to see any difference in the car's performance. I added the entire content and filled up with V-Power 98 from the gas station I usually go to, and I can say that around halfway through the tank, the car seemed to run smoother than before (better acceleration, better fuel economy). I might use it again after 5-8000km for maintenance.