with tire removed from ~Z~,
inflate to 5psi above max pressure (labeled on tire)
be sure tire is clean from dirt,rocks,grass,etc...
use only water flowing from a garden hose (very low flow)
find a starting point (valve stem) & slowly go over both sidewalls & then over tread;
the clean water will make small bubbles.
Perform this outside in the most light possible & you will find your leak.
I've had some pin-holes in the sidewall drive me crazy in the past & putting the tire in the tank of water would not expose it.
My Daughter's Fusion was losing 1lb. per week & turned out to be a pin hole in sidewall-near the shoulder.
Also ck. the wheel,,,could have a fracture in the Aluminum.
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