I was just about to buy a 1995 honda accord for $3,200. The owner said it had 83,000 miles on it.
I was going to buy it, then I just got a hunch to check the CARFAX . The CARFAX showed the odometer was rolled back , the car [actually] had 135,000 miles on it! I still wanted the car so I was able to buy it for $2,400.
I saved $800 using the CARFAX.