Par4QC That was the case for a long time here as well. Our Kroger was linked to Shell, even with some Krogers having gas pumps on site. Not sure that is still the case.
My father retired after 45 years with Shell as the head of their accounting department. I bet I haven't bought gas other than theirs a dozen times in the 50-plus years I've been driving.
Back to the topic...prices... I drove past today, and the sign was back to $2.39 ¯_(ツ)_/¯