From the tyr files I have looked at so far (just a few gt pro cars) they appear similar in some ways to those found in gtr2. There are now 2 lateral slip curves the first one drops of roughly the same as gtr2 but the later drops off a lot sharper. The brake and accel curves also drop off more sharply as the tyre gets worn so braking and getting the power down with worn tyres is harder than it ever was in gtr2. From the ones i have looked at so far there is very little differences between the different models but some have ever so slight changes in the wear rate, but the grip factors and slip curves look the same from car to car. Some have said they though the evo cars felt like they had hard tyres compared to gtr2 but if you look at the data then they look more like something between soft and medium for grip but the wear rates are nearer the soft tyres than anything else. Had a quick look at the eng files and the Lifetime Avg and var look much the same as they did in gtr2. Going to have a look around some other stuff later.