What kind of numbers are you talking? Mileage? Grip?
I have had a set of Nittos NT420S on my Dodge Ram since 03 and I still have more miles to go. I rotate every 5000 miles and regularly check the air pressure. That's really how you get lots of wear out of tires MOST of the time anyways. But you knew that already... lol
When I finally get a new set for my truck I will try to buy Nitto again. The shop that I used to get my tires from closed down because of the economy not long ago so I will have to start looking else where for the Nittos.