I can't see running a whole lot longer on NT01's than RR's. WRL limits tires to 200 utqg and on the Miata they are done after one day, but you really have to consider Mike's point about the tire curing. Race tires are not fully cured from the manufacturer, heat and age cure the rubber. Neither of these factors really impact the tire in an enduro because the tread is gone after a day before the tire cures and gets hard. There isn't much point in hoarding tires either because they will age harden. Why don't you run a tire test? I bet everybody would want to know if there is a grippy iron wearing tire that won't chunk out there. I doubt you would be protested.