Try this, carrying you air gauge, as everyone should, along with a tire repair kit, head out on a tankful of a ride with maybe 1-2 stops. Check the pressure at each stop. Whatever it reads after a run at speed for any real distance is the pressure you’re running all day. If you start at 42 after a half hour or sooner, the psi can rise 2-4 pounds, especially in hot weather. Do you want to ride with 46 psi?