We use 10000 ml Methadose liquid cherry at our treatment center as well and do not have a shortage daily. In fact we currently have an overage. It was explained to me that each bottle has extra mL to account for priming and tubing loss so over time, the extra accumulates. Do you calibrate daily? I understand your concern about this. I love working here and how rewarding it is helping my patients, but it is nerve wrecking that DEA can come in at any time for inspection. I hope this helps and you find out where the discrepancy is coming from.