During ownership of my second 135, I managed just under 47000 miles in a year and a half. Or just under 35000 in 1 year depending how you want to translate it.
My driving pattern somewhat resembled the image in the ops post
I now no longer have the car, I didn't want to be putting that kind of mileage on a modified turbo engine.
That being said, there's no better car then a turbo car in mountains.