> Just like when you're running low on gas (but not out and not in a rush to fill up) you might plan a visit to a discount center like Costco during off-peak hours
Anecdata: I never ever do this. The marginal savings isn't worth the mental space it would take to plan that sort of thing. To me it's all about the availability and the immediacy, so I fill up with premium any time it's convenient and don't even look at the price.
I regularly have 10+ hour driving days and don't want to have to wait around even at superchargers. I'm open to the idea EVs, but only once they can fit into my needs instead of curbing my needs for the sake of EVs.