The Energy Information Administration (EIA), created by Congress in 1977, is a statistical agency of the U.S. Department of Energy. The EIA provides policy-independent data, forecasts, and analyses to promote sound policy making, efficient markets, and public understanding regarding energy and its interaction with the economy and the environment.

EIA conducts two weekly Computer Assisted Telephone Interview surveys that collect prices at the outlet level. The first is the EIA-888 which collects prices of diesel fuel from truck stops and service stations across the country each Monday morning. The second is the EIA-878 which collects prices of regular, midgrade, and premium motor gasoline by formulation from service stations across the country each Monday morning. Average prices of gasoline and diesel fuel through outlets at the five Petroleum Allocation for Defense District (PADD) levels, regions of the country, sub-PADD levels, and the state of California are released by the end of the day through Listserv, the Web, Fax, and telephone hotline.

The diesel fuel prices that are released are used by the trucking industry to make rate adjustments in hauling contracts. Gasoline prices are frequently quoted by the media, particularly during times of rising or falling prices, because of the general interest to the public. The gasoline prices have been used in analyses of the cost of the Environmental Protection Agency regulations requiring oxygenated and reformulated gasoline in specified non-attainment areas. 

Data Supplied: Morningstar collects EIA data via the Weekly Natural Gas Update, Weekly Petroleum Status, Weekly Coal Production, Gasoline and Diesel Fuel Update and the Petroleum Supply Monthly Reports. US East Coast (New England, Central Atlantic, Lower Atlantic), Midwest, Gulf Coast, Rocky Mountain, West Coast and California weekly retail on-highway diesel prices.