This cat was returned to me on May 4, 2013 via a vet in Livermore, because of his microchip. He was missing 10 months in total. He had wandered 2.1 miles from where he was lost; no telling how many miles he really walked before he ended up for the last 6 months out of the 10, being fed in the backyard of a family with other pets. Eventually something happened to his eye (something caught in it, he's fine) and the family took him to the vet, where the vet scanned for the microchip and called me! The family was sorry to lose him, but we missed him so much more!