Costco has a standalone gas station in Mission Viejo, CA - https://www.costco.com/w/-/gas-station/ca/mission-viejo/1772 https://www.costco.com/w/-/gas-station/c

Costco has a standalone gas station in Mission Viejo, CA - https://www.costco.com/w/-/gas-station/ca/mission-viejo/1772 https://www.costco.com/w/-/gas-station/ca/mission-viejo/1772 I think this is the only one in US without a warehouse. The prices are at least $0.40 cheaper than nearby gas stations.