Also I would recommend that you check you have the latest firmware update. Often issues like excess toner consumption gets fixed if firmware fixes, although having read through the patch note it's not mentioned, but reduced toner usage may be grandfathered in from an earlier firmware revision
this is the link to the download and install instructions
There is a toner saver option if you go into the printer driver and set print quality to toner saver
also you can purchase extra high capacity toner cartridges which would save you money.
We started buying the Xerox B230, B310, C230, and C310 printers and they all suffer from similar problems, low page counts.
Every one of these printers has run out of toner before printing more than 200 pages, some are now on their second or third toner cartridge and still low page counts.
One printer had a waste toner failure a week after we set it up.
One died outright a month after we set it up.
These printers may not be very expensive, but they fail so often, and use so much toner that we're switching brands away from Xerox which is very distressing. We've been buying Xerox printers for almost twenty years.
I've complained to my vendors that I will no longer buy Xerox printers, and with the issues we've had with these current models of printers since last year, I won't recommend Xerox to others.