We move around frequently, so it’s whatever is locally available and cheap. I’m more of a middle of the road bargain hunter. I avoid the no-name or unbranded gas, because who knows what it is. I buy top tier when I can get it, but I won’t pay extra.
Costco is a great place to get TT and save money. More often I’m getting Shell or one of the other big brands. Join their loyalty programs and most of the time it’s the same price or less than brand x in the same neighborhood.
I’ll absolutely buy grocery store gas if it’s cheaper. My opinion TT is more important with GDI engines; Hemi not so much.