Total number of klm's before a demo vehicle is considered used ?.

[galaxy xr8]

What is the total number of klm's on a vehicle being sold by a dealer as new/demo allowed to be before it is considered a used vehicle ?

The reason I ask is I have been following a certain vehicle at a dealer and when I 1'st approached them about it it had 6,000klm's on it and was used as a demo, then I was told by a salesman at a future date that it had been sold, fair enough, but then today I was at the dealer again and seen the same vehicle was on the lot being sold as a demo vehicle but now with 15,000klm's on it.

The wife of the dealer principle had been using it as a daily, but then switched to a new GT, so now they are onselling it again as a near new/demo but with 15,000klm's on it.

I told the salesman that I believe with that many klm's on it now that I regard it as a "used" vehicle now and not a demo, he then proceded to tell me that a vehicle can have up to 22,000klm's on it before it is considered a "used" vehicle ?.

I was a little bemused at this and unsure as he was the same salesman that told me it was sold the previous time around, and when I spoke to the dealer princible today and told him that he was not happy as it was never sold, it was just used by his wife.