Hmmm…I don’t know, never had experience with old/new tyres (at least never knew were they new or old) but in terms of overinflating, it sounds logical so it probably affects the grip levels. Also, the air more dense during the day so engine is struggling more then during the night.
@alvinnunley That completely opposes what I experienced so far. It could be that the new tyres work better during the day and that I got rubish ones yesterday. It could (most likely) also be that the race karts are affected by tyre wear differently as they are much lighter in comparing to rentals so they handle higher temperatures much better. I actually always thought that higher the t° = more grip, before I found out when the best laps are set.
They are set at about 8-11PM every day, so I think in my case, tyres work better at night. Maybe I can figure something that will change my opinion, might be.