are required to document the odoometer reading on all vehicles they are accepting for repair. Did they give you any estimate or paper work if they did check to see if it has the reading written on it. If it does check that against the odometer when you get the car back. If they drove it over the past 3 weeks off the lot you will see a difference. 1-5 miles is about average if they moved it around alot durring the 3 weeks any more then that I would question. Hope that helps.