I commuted on 700x25 Grand Prix 4 Seasons tires with 330 TPI for about a year or so, about 3K miles, before the rear tire started to deteriorate. Later I moved the front GP4S to the rear and did another 3K miles on it, with just a cheap $20 Bontrager wire bead front tire from the LBS, which I believe has just 30 TPI. Now I have the same cheap Bontrager tires on both ends (rear one is new).

Is there really much difference in road commuting between 30 TPI and 330 TPI? I haven't noticed any real discernible difference in speed. Wind and temperature (amount of clothing) seem to make most of the difference in whether my commute is 65 minutes or 85 minutes.