Source: US. Bureau of Labor Statistics
Release: Consumer Price Index
US. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: Gasoline, unleaded midgrade in Midwest - Size Class a (over 1,500,000 persons) [CUURA200SS47015], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CUURA200SS47015, July 27, 2016.