My wife and I were in the drive through at CFA the other day...there was a guy who was in a jeep with a bikini top on it (very small minimal jeep roof covering) no one else was with him and he was wearing a frigging mask!
@txradioguy First, thank you very much for that informative post earlier on this thread, for which a few have given you kudos.
Regarding driving solo, while wearing a mask...consider that other loved ones either use the vehicle, or there are often times passengers are included.
That would be the only reasonable explanation, IMO.
Nobody ever gets inside my vehicle, and I use CLOROX wipes occasionally on the steering wheel, gear shift, emergency brake, control knobs and interior door handles, etc., because I may have touched something while getting gas, receiving change on my purchases and the like.