> Some shop around a few stations to find a slightly better price.

And those people are often bad at math or grossly undervalue their time.

Some people drive 10 minutes out of their way (20 min round trip) to save 5 cents/gallon. Even if you have a 20 gallon tank, that's only saving $1.00. I wouldn't take 20 minutes out of my day just to save $1, even 15 years ago when I was living paycheck-to-paycheck on $10/hr.