One of the things I left out from the original post was a conversation about the minumum XTOL needed with a guy in Kodak Professional technical support. According to him, the recomendation of at least 100 ml of undiluted XTOL per roll was primarily made because many people were re-using the developer, as you pointed out. Unofficially, if I always use fresh developer, they said they I should be OK down to 65 or 70 ml per roll (36 exposures, of course).(posted 8685 days ago)One other interesting comment the Kodak guy made: Apparently, they've been having so much confusion regarding the minimum amount of fixer being used, they're considering changing the published instructions to eliminate any mention of the 1:2 or 1:3 dilutions, including the proper development times.
I suggested less confusing instructions might accomplish the same goal.