Just changed my tyres again (to Avon Storm XMs), here's the mileage I got on the Super Tenere on the two types of PR4...
PR4 Front - 10,842 (i.e. two rears, was some mileage left on it but it was starting to feel a little loose so changed it anyway).
PR4 Trail Rear - 4,822 (around 500 miles...