Not the first hand experience - but users' opinion from other forum (my translation - forgive my English).
User was experiencing huge ink consumption during regular printing, what was bothering him was that the split between on-paper/into maintenance tank was like 2:1. He ended having his PRo-1000 serviced and then repeated his observations. Ink consumption dropped but below is translation of what may interest you in regards to small prints:
"For one A2 print printer uses maximum 4 ml on Lustre/Glossy paper in Standard quality with Gloss Optimizer on Auto.
Between A2 prints 0,18 ml of ink ends in maintenance tank.
It turns out, that despite sending to printer whole series of 47 prints 4x6 (account manager reports it as one print job of 47 prints and reports summary ink consumption for all 47 prints), after every of the 4x6 prints, printerdoes some maintenance, as if it has just printed A2.
To make things worse - for printing whole series of 47 prints, PRO-1000 used 16.6 ml of ink (incl 6.5 ml of CO) for prints and additionally 8 ml of ink ended in Maintenance tank (incl 3 ml of CO).
It is sick!
It turns out, that no matter which size it prints, it always "spits" 0.18 ml to Maintenance tank between prints.
Due to maintenance process between prints, printing 47 pieces of 4x6 took very long - maintenance between prints took more time than printing of each print itself.
As it is - this printer is not suitable for printing 4x6, 5x7 - total ink usage to print 47 4x6 prints was 16.6ml+8ml = 24.6 ml of ink. (in Poland it would equal to 18.5 USD)
One could place 16 4x6 prints on one A2 paper - so 47 4x6 prints would take 3 x A2. Ink usage in this scenario would be 3 x 12 ml + 3x0.18 ml into maintenance tank = total of 12.6 ml."
If you use Windows or Parallels - go for QImage....
Below is the link to original post (I Polish) - should you like to use google translator:
http://www.mva.pl/viewtopic.php?f=7&t=2925&start=60#p36792PRO-1000 small prints