As all the above plus 1 possible explanation.

Certain Peugeots (and I think it was 307/308 models) suffered from an electrical glitch which caused the odometer to over-read quite considerably.

As you have not come back and told us what you are driving and what makes you think this is happening, it's hard to say...

Oops, just seen his other post, it's a Mazda 3

Edited by 72 dudes on 16/02/2014 at 17:22