Every shoe always left foot. I get good mileage still around 2000 miles a shoe but I could get 3000 if I could find out why.
It even happens running barefoot, my 4th pinky the skin underneath rubs raw yet every other toe and my right foot is fine and I can go quite long on the roads barefoot.
Only thing I can think is it's because my left foot is wider? Is it supination?