Your warranty will run out according to your "in service" date (the day you purchased the car).

Example: Purchase date 4/4/2007 your 3/36 warranty will expire on 4/3/2010 and your 7/76 will run out on 4/3/2014, providing mileage limits have not been exceeded. Also be aware that any "extended warranty" purchased will run concurrently with you existing warranty.