1. How many klm do you get out of yr tires? 6,000-7,000 km if punctures don't kill them first. Do you monitor tire klm? Yes.
2. Criteria for replacing a tire? No more tread, a puncture that can't (or shouldn't) be plugged, or if it needs more than 2 plugs.
3. If yr rear tire gets a cut, and needs replacement do you place yr front on rear wheel, and the new tire on front wheel or just replace rear tire? Just replace rear tire.
4. Do you ride with a tire boot, or just use it to get home? Just to get it home.
5. Do you patch yr inner tubes that you bring home after a flat. NA
6. What kind of tires are you using? Maxxis Tread Lite 29x2.1