Midwest Petroleum is a gasoline and convenience store operating company with over 50 locations based in Illinois and Missouri, including one on Jeffco Boulevard in Arnold. The company is a marketer of ConocoPhillips gasoline and offers a wide range of items and products for customers, including various types of food, drinks, candy, snacks, water, and other convenience store items. Check the main site for details on the company or call to speak with an associate about placing products in stores.