GT350R typical tire wear?

[FogcitySF]

Heading out for track day over next couple of weeks and notice that the smaller most outer groove of the PSC2s has maybe 1.5/32s left, while the two large inner grooves have 5/32 left. When the car was new I wasn't paying attention to see if that outer groove was more shallow to begin with vs the two inner grooves. The very outside shoulder diagonal treads were definitely shallower and actually the wear seems to be about right for those. Is that outer groove supposed to be more shallow than the two inner ones? Thx.

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[jasonstang]

Most tires have shallower outter treads because they get used a lot less.