I’m 90% certain that I managed to (barely) spot Mercury below and to the left of Venus from the grocery store parking lot just after sunset. Appropriately enough, the one other time I think I spotted Mercury, it was also from a grocery store parking lot.
It was like trying to spot one slightly brighter pixel on a high-resolution display in the middle of a gradient. Faint enough that if I hadn’t seen it in the same place each time I looked, I would have dismissed it as something in my eye, or part of an after-image. I couldn’t really see much more than the fact that there was something there where Google Sky Map said Mercury should be.
It’s really neat that Jupiter and Venus sort of bracketed the twilight sky!