I have updated the spreadsheet for last weeks 120 hour purge, which I have been delaying on sending the print job to initiate the purge, so they have been weekly.
So another purge is already overdue and I plan to delay for a few more days.

I now have enough data to be more specific about the difference between a synched and unsyched 120 hour purge:
A Synched Grp1 & Grp2 purge will purge an average of 1.78g total.  (This compares to the 1.9g specified for a Pro9000)
An Unsyched purge will purge an average of 2.08g total.

That represents an increase of almost 17%.
I have seen on another forum that the amount of ink purged depends on the level of ink in the cartridge, but I see no evidence of that.
I don't have enough data to compare synched and unsynched Manual purges or purges related to cartridge removal.  However, these are all user initiated and would tend to be rare compared to the 120 hour purges.
طراحی سایت هتل طراحی سایت دانشگاه طراحی سایت سازمانی تبلیغات اینترنتی طراحی سایت انتخاباتی  طراحی لوگو لوازم یدکی مگان   طراحی سایت آژانس مسافرتی طراحی سایت بیمارستان  لوازم یدکی ال90 میزبانی وب  هاست لینوکس ثبت دامنه طراحی سایت طراحی سایت فروشگاهی طراحی سایت شرکتی طراحی سایت کلینیک سئوی سایت طراحی سایت پزشکی هاست طراحی سایت ارزان تبلیغات گوگل طراحی سایت صنعتی طراحی پورتال  بلیط هواپیما
 
Also, I have now replaced 5 of the 8 cartridges.  I waited to replace the first 2 carts until the printer driver reported "Empty".  The last 3 carts I swapped over when the printer driver reported "Low".   I have colour coded these levels in the spreadsheet.  Orange is Low and Red is Empty.  The reason I swapped over on Low rather than Empty is that I plan to try refilling using reclaimed ink from OEM carts.  See my other thread on "Wasted Ink" for progress on that aspect.
Bruce