Originally Posted by
fietsbob
All tubes are porous to some extent.. some more, some less. I was carrying a load, all day, for months . I felt the difference a few less psi made..
Do as you wish.
I routinely top off my tubes every two or three days. They usually just need a couple psi. But if you let it go a while, you're doing yourself no favors... especially if you're a heavy rider and/or carry heavy loads.