Under-used shoes

These are my running shoes:

You may notice that they are the same as my every-day shoes (except for color).  If you look closely you might be able to tell that they are on a treadmill track.  Saucony makes wonderful running shoes.  My friends wear them for marathons.  I wear them for every-day because they are comfortable, and seem to hit my non-existant arches in the right places.  Last time I needed new shoes I bought two pair, one for every-day and one for my treadmill (so they stay clean and lovely and won't hurt my track).  Would you like to guess which ones will wear out first?