Planning a trip by car? This AAA site presents gasoline price averages for eight regions of the United States: New England, Mid-Atlantic, Southeast, Great Lakes, Southwest, Midwest, Mountain West, and the Pacific Coast. Offers an online calculator that allows users to enter their starting city, destination, and vehicle information (for newer car models) to determine fuel cost, miles, and gallons used. Fuel price data is provided by the Oil Price Information Service (OPIS)
Although sponsored by the California State Automobile Association, this site covers the U.S. and most of Canada, presenting information derived from credit card transactions at more than 85,000 outlets around the country as well as direct feeds from individual chains. When you search for gas prices you will find the last price received over the past 7 days for those stations included.

GasBuddy.com: Michigan Prices
GasBuddy.com can help you find cheap gas prices nearby. You can select state-wide, Detroit, Lansing, or Grand Rapids, or go up and out nationally. It is a network of [over] 170 gas price information web sites that helps you find low gasoline prices." Search for prices by ZIP code." Information is member-supplied. Registration (free) required to post gas prices on most of the gas sites or to create a fuel log for tracking your expenses. Includes tips for conserving gas, links to news stories, and other resources.

The basic function of the website is to help you find the lowest price of gas in your neighborhood. ... All of the 128,000+ stations in GPW are part of huge inventory of gas stations that our spotters have submitted over the years." Search by zip code, intersection, city, state, and other access points.

Information about how gas prices are determined, including U.S. gasoline usage and consumption, regional price differences, a percentage breakdown of components that determine gas prices, control and impact of the oil market by the Organization of the Petroleum Exporting Countries (OPEC), U.S. domestic production and supplies, and related resources. Also, check out the Gasoline and Diesel Fuel Update site, which provides current data about gasoline and diesel prices in the United States as well as selected historical information. Includes information about retail and spot prices, a list of Petroleum Administration for Defense Districts (PADD), and links to related information. The data is updated weekly "every Monday by 5:00 p.m. (Eastern time)." From the Energy Information Administration (EIA), an independent statistical agency within the Department of Energy (DOE)
The heart of this site is the "Find and Compare Cars" database, with miles-per-gallon numbers for vehicles from 1985 to the present. Includes a gasoline price page with links to national and regional fuel price information, information on vehicle safety ratings and air pollution, gas mileage tips, and material on hybrid and alternative fuel vehicles. Also find the most current model year "Fuel Economy Guide." From the U.S. Environmental Protection Agency (EPA). You may also want to visit the Department of Energy's Gas Price Watch Reporting Form site, if you believe there may be price-gouging, or price-fixing, please contact your local authorities and fill out the form [provided on this website].
A compilation of very useful Government documents concerning gaasoline prices. Includes an Overview, Statistics, and Solutions.
