Tip - Changing the actual mileage also, called "Clocking" on the Dashboard.

I have been a victim of clocking and I had to pay the price for such nuisance. My only tip is to watch out for clocking.

"Clocking is the illegal practice of winding back the odometer on a high–mileage car to increase its apparent value and asking price. Every 1,000 miles removed increases the value substantially."