Source: US. Bureau of Labor Statistics
Release: Consumer Price Index
US. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: Gasoline (all types) in Midwest - Size Class D (under 50,000 persons) [CUUSD200SETB01], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CUUSD200SETB01, July 29, 2016.