I race at 100% and every time one of my tires is absolutely worn in like 5 laps. At Miami i spent 5 laps on hards and my right front was at 14%. The rest of my tires were at 3%.
Ideas
We did a 2 player career last night in Miami (both on controllers) and the tyre wear was insane. Hard tyres were done after 5 laps, car all over the shop on turn in and exits. Impossible to compete with the AI (on 95 rating) with this kind of wear.
Just to expand on this, completed the same race weekend a couple of weeks earlier and there were no such problems, wear was gradual. Feels like the goalposts have dramatically moved since the update although nothing has officially been declared to have changed in the release notes.