As far as warranty, I would just bet that unless you are talking to the place where ya bought, you`d be not well looked after.
The thing that I have concentrated on, with my tires, is the need to get them checked twice a year and I get that with the shop I deal with. That plus flat repairs, etc. I look for a dealer network that has more than one or two shops. In my case, I use Kal Tire because they have an outstanding reputation for looking after their work, both tires and mechanical and with shops in all of western Canada. I use their house brand too, on the RV. Where I live, snow can come hard and fast 6 months of the year and in BC we have a standard, referred to as the `Snowflake`. It is on the sidewall of the qualified tire and that will get you past any road checks for snow tires or chains. I get 6 tires for $1,100, so I figure I am far ahead.
Plus, with my 4 wheel drive side of life, the tires get me to where I want to go and out again.
Gary Haupt