The Domino Effect on Pro 9500 / Pro 10 for OEM ink Users...

[palombian]

Canon's yield calculations for various printers using various paper sizes: https://www.usa.canon.com/internet/portal/us/home/products/groups/page-yield

Red River's yield estimates for the 9500 Mark II: http://www.redrivercatalog.com/cost-of-inkjet-printing-canon-pro9000-pro9500.html

Red River's yield estimates for the Pro-10: http://www.redrivercatalog.com/cost-of-inkjet-printing-canon-pro-10.html

You can find more Red River estimates by searching on the term "Cost of Inkjet Printing" (without the quote marks)

These Red River estimates come down to about 1 ml per A4 photo (for people who live in the metric world), that should make about 4 10x15.
Quite optimistic IMO, take a large margin for cleaning if you spread your prints over time.