I went several months on "low toner" before it actually ran out. I almost always print on 'draft' setting, which makes it last longer in general.
Try going into the Admin settings of the printer - usually via the admin web interface of the device - and look for Print Quality/Density settings. You can set the printer to use even less toner/ink than Draft without having to sacrifice legible quality. So you'll be able to print in good quality while using less ink. And you can set it to use even less ink than Draft mode usually does.