I'm looking for a rule of thumb as to how much air loss over time is considered acceptable / normal for a hybrid tire.
Surprisingly I have not been able to find much on this upon Googling. In this post:
Two people with road bike tires in the 110-120 psi range stated they normally lost 5-10 psi per day. This seems high, especially if closer to the 10 psi figure.
In my particular case, I'm running 700x32mm tires and the sidewall states "Min 35 psi, Max 75 psi". I'm currently inflating every other day to about 75 psi (perhaps slightly higher, but always under 80 psi) and I find I'm loosing about 1-2 psi per day, which seems roughly normal but I'm really not sure.
I'm using Giant tubes I got from a Giant dealer so I'm confident I'm not using poor quality tubes, and the tires are Giant branded hybrid or "gravel grinders" that are relatively tough and in good shape so I'm confident I don't have a puncture or slow leak problem (wheels/tires/tubes all OEM/stock parts on a 2017 Giant AnyRoad CoMax).
How much is considered normal?