actually i dun quite understand anfernee's question, but i guess he is asking whether cars using digital mileage meter (WAJA for example) can reset the mileage number to lower to (from 120,000KM to 60,000KM for example) get a better selling price.
IMHO, yes, it can be done, as long as you have the right tools and the right way to re-write the piece of information.