I’m 60yrs old and have never once thought about checking the air pressure in my spare. Thanks for giving me something else to worry about!
I never cared either, until that one time 5 years ago I had a flat on the road and the spare tire pressure was at about 16 PSI.
Now I crawl under my rig about every 3 months and check the pressure on it...
Wifey's Honda has no spare, it has a can of fix a flat and a 12V air compressor...which, in the instance I mentioned above, would have been preferable to the under (not) inflated spare...
PSA: Another suggestion, for any of you living up here where we salt the roads...actually lower the spare from its winch every fall and coat the cable and the winch good w/ some spray lithium grease. If you don't, after about 5 years of ownership, that winch is rusted up and won't move (ask me how I know: same case 5 years ago...ultimately hit the blue OnStar button and let the poor tow truck driver crawl under there and cut the winch cable, swap the tire, and send the bill to GM
).