Since this topic comes up a bit, I'd like to do a little academic analysis on the matter. The end goal is to make a rudimentary database that will allow one to query expected sole life based on a few factors. I need data from SF first, though, and I'll start by providing my own. If you like this idea and want to run with it please provide a complete set of your own data, identically formated. Pairs of regularly worn dress shoes in M-F rotation: 7 Approx. miles walked on pavement each work day: 1.5 Approx. body weight: 170 Typical life of leather sole: 12 months Your turn. The more people that reply, the more accurate the results/tool will be.