Hi.
Well, it is a bit complicated.
First: you have to edit the "tyre wear" value.
But: the AI's tyre wear is automatically calculated by the game.
Your depends upon, at least
- car setup
- track air resitance (MD)
- track grip (MD)
- fuel load
So to have a big difference between fresh and old tyres, you might set a higer value for "tyre wear", so your tyre wear will be very high and fast... but i don't know if this is a good or bad solution.
Bye.
Claudio