I bought 4 Dunlap tires over a year ago that had a 60,000 mile warranty, i had only put about 25,000 and the tires were more than half the tread gone.
keep in mind i have done regular rotations and kept tires inflated properly (all by tire discount).
When i raised this as an issue, they acknowledged however, were not willing to do any thing about not even contact the manufacturer, of course they were very willing to sell me another set of tires ...
having an appointemente does not seem to mean much to them either ...