Gas prices nationwide have have remained fairly steady over the past few weeks. According to Triple-A the price of a gallon of regular unleaded has held at 3.12 a gallon. Mississippi reports the cheapest gas in the country while Hawaii reports the most expensive gas in the country at 4.54 a gallon. California is a close second at 4.45 a gallon. San Luis Obispo County is reporting an average of 4.68 a gallon. In Santa Barbara County its currently 4.45 a gallon.