Just so everyone understands:
OE tires are designed to the specs put out by the vehicle manufacturer. In most cases, these specs result in a tire that the average consumer will be unhappy with - because the tire is designed to give good fuel economy, and they get that by sacrificing treadwear and/or traction.
Because the tire manufacturer isn't designing the tire, and the vehicle manufacturer doesn't want the extra cost of doing tire warranties, tires usually don't come with a mileage warranty. There are a few exceptions.
General Motors provides a bumper-to-bumper warranty for 3 years/36,000 miles - and that includes tires.
Mercedes has something similar.
Michelin provides a mileage warranty on some of their OE tires.
But in general, OE tires - the ones that come on a new car from the factory - do NOT have a mileage warranty. They also do not have a road hazard warranty - BUT - they DO have a materials and workmanship warranty - which means that if the tire has a defect, it will be covered by warranty, but if it wears out prematurely, or suffers a roaf hazard, the tire is NOT covered by the warranty.
You may hear people say that XYZ covered worn out tires under warranty, but the reality is that that one a one-time, customer relations type of situation and not warranty coverage at all.