developer quantities

I develop mainly with xtol and tmax. I have read that you need anywhere from 100-200 ml of xtol/roll of film, depending on the type of film. I was wondering if anyone has had trouble using only 100ml or what other people use.

Also, I use Tmax developer and (usually 1:4 dilution) and was wondering if anyone has read how many ml of tmax/roll is needed. I use a rotary processor and was curious if anyone has seen underdevelopment developing two 36 exp rolls using only 50ml of tmax on any types of film.

Thanks for any info.

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