Learned something interesting the other night at a Hankook/Tire Centers class/event last week. You cannot compare UTQG ratings between manufacturers. Found out that every tire manufacturer has their own 'reference tire' and that this is what ratings such as treadwear and traction are extrapolated from. As a result of this, treadwear and the like, can only be compared within manufacturers. Unfortunately-Goodyear, Toyo, Nitto and Hankook are all made by different companies; and, as such, you cannot-reliably-compare treadwear/traction ratings between them. Either way, a ZR tire is going to wear reasonably quick and garner you decent traction. Of course, when throwing 400ish lb-ft of torque through them, no tire is going to work all that well, on the traction front, unless it's a DR or slick.
Just my .02
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