I run the extralights on my long distance bikes which run 700x32 & 38c tires, and they are as good as everyone says. I buy them three at a time and it really pains me to see the bill for $250 for three tires, but I haven't found a 32 or 38c tire that I'd rather use for randonneuring. I don't really keep track of mileage, but I would guess a rear tire lasts 2-3,000k and a front tire double that.