Tesoro Refining & Marketing Company is part of Tesoro Corporation, which is one of the largest independent petroleum refiners and marketers in the Western United States. The company operates more than five refineries, wholesale and commercial marketing operations and a network of retail fuel stations. It has a rated crude oil capacity of nearly 560,000 barrels per day. Tesoro s retail marketing system includes more than 500 branded retail stations under the Tesoro and Mirastar brand names. The company also has 2Go convenience stores and serves motorists at Wal-Mart refueling locations. It supplies the commercial segment with heavy fuels and aviation and marine gas. Tesoro is also a major producer of distillates. The company markets wholesale motor fuels to unbranded dealers. Tesoro Corporation was established in 1968. Tesoro Refining & Marketing Company is headquartered in Federal Way, Wash.