The road hazard certificates are not for pro rated mileage wear.DT does offer a road hazard warranty that pro-rates tires if they need to be replaced. I always get it and have used it on several occasions...
http://m.discounttire.com/dtcs/infoCertificate.do
Conditions and Exclusions
Non-commercial service includes use by the owner in his/her regular trade or business but excludes commercial truck, racing, off-the-highway, taxi, limousine, or similar service. Passenger, SUV or light truck tire road hazard warranty (if applicable) does not apply to tires used on commercial trucks, recreational vehicles or off-the-highway service. Mileage warranty (if applicable) applies only to tire's original purchaser on the car, SUV or light truck on which originally installed. These warranties do not cover tire damage, destruction or failure from fire, vandalism, or accident, irregular or premature tread wear caused by improper inflation, misalignment, or imbalance of wheels, worn out shock absorbers or brakes, damage or failure due to other non-tire causes such as being run flat, mechanical condition of vehicle, cut from rim or chains, or any willful abuse. A tire is not adjustable for problems of appearance after the first 10% of wear. All Certificates expire three (3) years from the date of purchase or at such time that the tire has less than the legal tread depth (3/32") across the tread, whichever first occurs. Terms of manufacturers' warranties may differ.
These limited warranties are the exclusive warranties of Discount Tire stores, are in addition to the warranties of the manufacturer, and set forth the exclusive remedies available to the tire user. Discount Tire stores shall not be liable for any consequential, special or contingent damages or expenses arising directly or indirectly and no company representative may enlarge or alter the terms of the Certificate.
They specifically state they are for road hazards. If the tire doesn't suffer a hazard they won't "pro rate" like other stores. Also, the cert is only valid for 3 years.
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