BP Gas Brand is a term used to refer to two of the most popular gas brands in the United States, ARCO and AMOCO. ARCO stands for Atlantic Richfield Company and is a subsidiary of BP America. It is known for its low-priced gasoline and convenience stores. AMOCO stands for American Oil Company and is a subsidiary of BP America. It is known for its high-quality gasoline and convenience stores. Both ARCO and AMOCO are widely available throughout the United States.