When the toner has almost finished from ImagePress C1 the display in the software and in C1 is that it is completely full 100%. But after some prints changes to "replace the toner catridge".
How I can see the real content in the toner catridge from the software or from C1?
Is it another one "bug" from canon?

From what I know - the ipC1 machine doesn't display the actual amount of toner, it can just say either it have sufficient for the work at hand or it has not.
We've made just about 5000 A4 prints with the start amount of toner, so we haven't meet this situation yet.

By the way, could you please, provide the information - how much prints you were able to produce before the toner ended ?

Thanks for the reply.
The most of our printings (80%) are in irregular size (32x45) and the numbers are:
1) at 8800 we change BLACK
2) -- 10900 -- CYAN
3) -- 11000 -- YELLOW
4) -- 11600 -- MAGENDA

Thank you for the numbers provided.
As for me - it seems that toner's lifetime is quite ok, from those numbers.