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A couple of months ago I asked a friend, who runs a tire store, about the regroovable aspect of the G614. I asked if it is worthwhile and cost effective. His answer was probably not. He said they can only add about 2/32 to the tread, which is not really very much. He didn't know the cost but was very doubtful it would be cost effective. Maybe I'll check into it when we get low on tread but at three years+ and a bit over 20k miles on the tires, it's looking like they'll exceed the age limit before the useful tread life is gone.
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