I figure that has to mean logged in. For instance, on my 3 devices, I am typically logged in on two of them all the time, so I’m probably accounting for two of those users. I really wonder if 19 other people have the site logged into two devices all the time as well. I’m guessing that about 6 or 7 of us keep a close tab on what is up on this site, others only post when problems arise with their cars. That would explain why the number of posts cycle with the seasons. Not nearly as many people tinkering with their Capris from November through April so traffic is minimal. Posts ramp up quickly as people pull their cars out of storage and have to address the consequences of a car sitting for months and scramble to diagnose and find parts.
My iPad and iPhone can keep me logged in on Safari, while I don’t keep my windows computer powered up continuously or I would account for yet another user in the count.