Not as low as you'd think, considering numberplates are made consecutively, and are normally shipped to the same city/town ect. But the chance that they're next to eachother is pretty fuckin low.
Three of my families cars plates have consecutive numbers. If two of us park next to each other at church say or at a kids game, it would look like that.
It's a pretty powerful one, I think. It can convey so much.