They used to be made in Germany and supposedly the new ones are not made in China and I've heard the mileage has gone down due to that... I don't know.
I just put a rear Metzler Tourance Next tire on the Super Tenere - it's made in Germany so if I can ever stop working I might be able to give a mileage report, of course, it's still apples and oranges since it's not an ST.