So I woke up this morning with my head a little more rested than yesterday (gotta love Satur-Wine-Days!) and I figured out that I could simply pump the tire up to X pressure, disconnect it and subtract the new reading to get an approximate air loss.
At 70psi, I reconnected it and got 55psi. Air loss is more or less 15psi.
Last edited by eduskator; 04-19-21 at 08:46 AM.