I have been researching about tyres and it seems the most common and recommended change is to 185/65/R15. The cost of change to a good tyre like Yokohama Advan Db will be around 25-26K (after accounting for selling stock tyres).
Now the question is if the advantages of changing tyres on new vehicle (better comfort, less noise, better road grip etc.) enough to justify the costs (25-26K investment & voiding of suspension warranty)? What do you all advise?