After some muddy runs I've retired by default khaki Lone Peak trail shoes after around 1000km. This is earlier than previous shoes of this model and was due to me losing confidence in the sole which was worn almost smooth. In the past the shoes have lasted 1400km and failed with tears to the upper. Perhaps the v6 shoes have a slightly softer rubber? Anyway, in wet, slimy conditions a heavily worn sole isn't especially safe.