Maybe it comes from being an umpire and having to let unhappy coaches and fans comments and complaints roll off my back, but mostly I just let them have their periodic grumble about how I missed this number or that number, try to look concerned and nod my head. It's usually over soon and I can get back to work.
But if they really push me about overallowed I shrug and say "I don't know. You have all the data on telematics so please tell me where I sat on my ass for two hours and stole from the company. If you can tell me how to safely get home two hours earlier I'd love to hear it!" The conversation usually ends after a few more growls and comments that I generally fail to hear. Then I go on road. Come Friday I happily cash my check!