Odometer reading missing
What has happened to the odometer readings? I drive two cars for my business depending on the # of passengers. I put the start and finish odometer readings of my van after a drive to the airport with 4 passengers. Today I only had one passenger so I used my Prius and when I went back to look for my ending odometer reading for the last time I drove the Prius it was gone. I need that reading. What have I done or what has happened? Does anyone know? Thank you in advance.