Is there any country where it's advantageous to speak more than required to the police? (I'm sure there are some countries where you're required to speak more than in the USA where you're legally allowed not to speak at all without a lawyer)
> You do not have to say anything, but it may harm your defence if you do not mention when questioned something which you later rely on in court. Anything you do say may be given in evidence.
I think it's more a "why would it be problematic?" and not so much if it's advantageous. Unless you're guilty, but then it's normally advantageous in the sense that your punishment often reduced when you admit guilt.
I personally have always played along as the police are always very friendly when making rounds, and wish to maintain that friendly relationship. I also consider myself a beneficiary of the low crime rates here, and consider participation to be a civic responsibility.