He has initially claimed that it does 8kmpl in city. In the latest one he is saying that it does 9kmpl.
And also YOM has increased from 2002 to 2004
What I understand from that is, he is trying to attract people and get them to see his car.
I have some experience with these kind of people. Once I was searching for a 2004 FB15, I found a one in a paper advertisement. I went to see the car but it was a 2003 one. The owner claimed me that it is 2003 Dec. So he called it 2004.
When people find it hard to sell their cars, they try to get people attracted by saying lies.
For the comment on FB15. There is no point of deceiving people like that. Simply you can't do that for a very common car like FB15. Everyone knows it doesn't do 12kmpl in city.
Since Verossa is not a common one, most of us don't know how it does on fuel.