I've just done a search of previous threads for info on how to edit the tyre wear, and I found that the recommended fix was to edit the magicdata for each track and change the wear values to 55 and 54.
I've tried it on the Argentinian track, but within 15 laps the best I can manage is 2.5s off my best time which I set on lap 3.
I think I changed the data correctly - I used cmagic compiler and changed the data in notepad and inserted it into the track.
Can anyone suggest what I have done wrong or what else I could try?