howzit,
Attached is a picture of my 2nd rear Karoo 3 tyre and circled are the markers that I am aware of. I got about 10,000km out of my previous karoo 3 but with lots of commuting on tar. Also includes a trip to Lesotho from Cape Town via PE and Transkei. Majority of tyre was eaten on the Lesotho trip. At first I did not think I was going to finish the trip on the tyre. The trip was about 4,000km. Then back in Cape Town commuting, I got a lot more out of the tyre. Heat cycles could have something to do with it too and maybe I am not too hard on the throttle. but always ride on Dynamic mode.
I could have gotten another maybe 1,000+- km out of the old tyre but for safety sake i put a used anakee 3 on and i was soon going to GS Trophy in Natal.
I tried to heat cycle my current rear tyre to see if it makes a difference.
Cheers
Rory