I have been using Tourances on my Adventure. Front was changed once, after 15,000 miles. Rear has been changed twice, after 11,000 miles.
This is doing regular commute into/out of London and bombing it every other week up and down the M40/M4.
the bike is due for its 30,000 service [booked in for June with North Oxford]. But I will be changing my tyres soon afterwards.
I have always been a bit disappointed with the wear on the back, especially as it squres off to such an extent that I HAVE to change them, but with plenty of tread left. The wear on the current [3rd] set is proving to be somewhat disappointing, as it has been only 7,000 miles since they last got done and I don't push the bike in Winter.
The front is due for changing in about 2000 miles. It is nearly down to the 2mm.