I'm not a pneumatic engineer so don't know the exact formula but assuming you're using the same pressure gauge the 85 deg temps might account for the higher pressure if say you took the original pressure reading in temps well below that. Also plenty of room for errors trying to find correct tire pressure in multiple attempts with high pressure tires. Hopefully a more educated poster will chime in.
Last edited by Crankycrank; 05-29-22 at 01:20 PM.