Methodology and sources

Sources

EIA Gasoline and Diesel Fuel Update: weekly retail prices for the U.S., regions, nine states and ten cities (gasoline) and regions plus California (diesel).
EIA weekly retail history series for regular, midgrade, premium and diesel by area.
EIA weekly spot prices: jet fuel, ULSD, heating oil, gasoline, WTI and Brent.
EIA Heating Oil and Propane Update (State Heating Oil and Propane Program): residential and wholesale heating oil and propane by state and region, weekly October–March, read every six hours.
EIA Weekly Petroleum Status Report: crude, gasoline and distillate inventories and refinery utilization, read daily.
EIA Electric Power Monthly, Table 5.6.A: average residential electricity price by state (preliminary, about two months behind), checked daily.
EIA Short-Term Energy Outlook: EIA’s official monthly forecast, shown as published, checked daily.
DOE Clean Cities Alternative Fuel Price Report (quarterly): E85, E15, CNG, LNG, propane autogas, biodiesel and renewable diesel. Updated by hand each quarter.
State fuel taxes: Tax Foundation, State Gasoline and Diesel Tax Rates, July 2026 (state statutes). Federal: 18.4¢ gasoline, 24.4¢ diesel.
Annual price history: EIA annual averages of weekly retail prices (via FRED series GASREGA and GASDESA); inflation adjustment with BLS CPI-U annual averages.

Home heating fuels

State pages show EIA’s state residential average where SHOPP surveys the state, otherwise the average for the state’s EIA region where one exists, labeled. West Coast states are not covered. Week-ago and year-ago values are EIA’s published changes.

Calculators

EV, heating and fill-up calculators default to the EIA prices above for the state you pick; you can override every input. Energy contents: heating oil 138,500 Btu/gal, propane 91,452 Btu/gal, electricity 3,412 Btu/kWh (EIA).

States

For gasoline in CA, CO, FL, MA, MN, NY, OH, TX and WA we use EIA's state averages. For diesel in California we use EIA's California average. Every other state shows its EIA region's weekly average, labeled on the page.

Freshness

The site checks EIA every six hours. Each figure shows its survey date; a series that has not updated with the rest is marked with its date.

AI brief

When enabled, an AI model drafts a short weekly summary from a list of that week's figures. Every number in the draft must match a supplied figure and predictive language is rejected; otherwise a plain template summary is published. Last check: Nov 9, 2026.