The good thing about this kind of liquid servicing is that it's cheap and easy to do/use and once a good glug has been used you only need a little top-up now and then.
I've just added about 50 ml to a near full tank after a ride-out as I don't know how long it will be before I use the bike again as my work can take me away so I like to use the additives as a fuel stabilizer.Cheap and easy fuel insurance to me