I tend to refill around a 1/4 tank and usually stop at the same Loves station on my way home. I like it there, the same usual crew given the time of day I usually stop in, they know me, I know them, I just pull up and wave and the pump turns on. Nice thing about repeat business.

However If I'm not in my hometown and out on the road, I just stop wherever I can get 91+ because saving 2 dollars in the end after I spend 50-60 to fill up... it's just not worth the hassle of finding the cheapest place.