Sinclair gas still exists? Last I heard it changed its name to ARCO (some forty years ago) . . . then it disappeared.
From wikipedia:
http://en.wikipedia.org/wiki/Sinclair_Oil_Corporation
Currently headquartered in Salt Lake City, Sinclair is the 38th-largest private company in the United States.[12] There are 2,607 Sinclair filling stations in 20 states in the Western and Midwestern United States. As of 2010, the corporation currently operates two refineries — one in Casper, Wyoming, and one in Sinclair, Wyoming.