Phillips 66 is leaving not Shell.
https://www.politico.com/news/2024/10/16/phillips-66-california-refinery-closure-00184058
I cannot find articles with Shell.
It is my understanding Shell is closing many of their gas stations.
Search Shell sells Martinez refinery. You will get pages of articles on the sale in 2020
It is my understanding Shell is closing many of their gas stations. So they may not be actually leaving but reducing their presence… a lot.