“Their gas is the most expensive around.”
I haven’t checked in a about a year, but in my part of Florida Wawa gas prices were always in line with those of the other vendors.
When Wawa added gas pumps here (before it was just a corner store) they followed a pattern: it starts really cheap, they undercut everyone’s prices. People got used to buying it there. Then they ratcheted up the prices, yet people still go for the convenience. They are typically 10+ cents per gallon above the typical gas stations around here.