I have not had the KDW on my car so I can't speak from first hand experience but the general feeling of the ones that have posted here is that they last a very long time if they are not abused. They are very hard. They most certainly last longer then the Goodyear GS-C or F1 that was used on the 98 SVT. They wore like butter.
Depending on the tread depth of the other tires I would be inclined to replace either one or two tires at this time.
