What you could do is setting up a replenishment system with XTOL. Basically you make a working solution, often 2.5 L or 2 L is used of undiluted stock solution. This working solution you use to develop your film. Every time you develop a couple of sheets you add 75 ml or 80 ml of stock solution per 4 sheets of 4x5 film to the working solution and discard what is left over of the developer you have just used to develop your sheets. Developing times can be found on the Kodak data sheet on XTOL. It takes about 8 films to get from 2.5 L of stock solution to 2.5 L of working solution, extending your development time with 30 sec with every new round.
There is plenty of information on how to set up a replenishment system on this forum. It allows you to use large volumes of developer without producing too much waste. As a bonus it produces excellent negatives in my opinion.
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