I don't think this has been discussed, but then again TGR search...
I'm going to give this a whirl this year (both as a driver and rider) - https://treadshare.com/. Hopefully it can be reliable, especially if a rider and on the return.
There's also this one - https://www.caravancarpool.com/ - but doesn't seem as active.
I always feel guilty pulling into a lot solo. Maybe one of these gets some real legs and helps some with traffic, parking, cost, climate, etc.
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