I'm curious how many Miles I should expect on a set of GP4KII's before swapping them out.  I have 7k on my rear and 5.3k on my front.  Neither tire shows any visible issues, I haven't been riding long so I honestly don't know what to expect and have not put this many miles on a tire to date.  
 
I realize there are many variables that should be considered in this question, so let me say the front has never flatted, the rear has one.  I run flat attack and mr tuffy liners in both, you see I hate flats as not only do they disrupt my ride but they frustrate me beyond imagination.  Some weight weenies will say that I'm weighing down the bike but as long as I can ride the speeds I do I'm not going to worry about a few extra grams of "flat resistance".  Both wheels have the original tubes as the rear sealed itself when the flat occurred and that is why I like flat attack.
 
Your thoughts are appreciated.
 

Thanks Tony
 
Forgot about the wear indicators, checked them this morning and they are still there on both tires.  I can see where they are wearing and starting to square somewhat but hey I figure they still have another 500-1000 miles in them.
 

I've got some Big Schwalbe Apple Tires on my Typhoon. I've noticed this weekend, that the center is already worn smooth.  
I've maybe at best put 1K on the tires.  
Is this typical or just these aren't the greatest tires?

The street we live on is a 1/2 mile square circle with one way in/out, so in the evenings when we ride it's  100 yards of flat then turn. Slow climb for +200 yards. 100 yards downhill, then we arc through the curve on the end of the downhill, so maybe that is encouraging more wear. I just didn't know if the tires were supposed to wear that quick.