“Clocking” is the illegal process of rolling back an odometer to a mileage lower than the actual miles driven. This crime is most prevalent with late-model vehicles, which have accumulated high mileage in a relatively short period of time, such as typically occurs with fleet vehicles. If you think odometer tampering is a thing of the past, you should think again. From 2007 to 2010, there has been a double-digit increase in odometer tampering.