RE-11 if you have the loot, Hankook has pretty decent reviews if your on a budget. Either way, 18k miles for high performance tires are the average lifespan, soft material. You might be able to stretch the front tires a little longer, maybe up to 25k-30k under normal driving. OP, I doubt the dealer or manufacturer will be any help. They will prorate the amount of tread left over and most likely say it's too worn out. Worth a shot, but it would be easier to just buy a 2 new tires and call it a day. They should at least be replaced as a pair anyways.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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