The best way is to figure out the original in service date for your vehicle. You can do this at any Hyundai store.
Charles is correct. It is from in service date. You can estimate by your model year though! Hyundai is a 60,000 mile warranty for 5 years. Remember your car was likely sold before the year it is (e.g. You can buy 2018 cars even though it is 2017). The power train is a 10 yr 100k mile warranty as well.
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