When you get to 50 ml Pull the cartridge, Verify that the cart has Ink. If so then Weigh it and calculate the correct number.
Run a few more small Jobs and then trash it.. 50 and below is the automatic change the cartridge number.
The risk of you trashing out $200 of media aint worth trying to run a cartridge dry. It is a Bad Practice and you are going
the get spanked sooner than later.
Our profession has waste and some jobs have a lot of waste. Your price to the customer includes the waste.
It is what it is.
Printhead Doctor has exceptional Inks and they always produce better numbers on the printer, a lot better.
You will need to buy the HP Opto, but dial that 'ish back.