How the numbers are built

Sources

FuelWatch (WA Government). The RSS feed for today, tomorrow and yesterday, by product, for every WA servo; the monthly files of daily prices per site since 2001 (CC BY 4.0, data.wa.gov.au); and the yearly files of terminal gate prices at each WA terminal. Checked every few minutes around 2:30pm WA time.Australian Institute of Petroleum. Weekly average retail prices for each state, capital and about 150 regional towns (from Motormouth/Informed Sources data, published on Mondays for the week to Sunday) and the daily average terminal gate price for seven capitals since 2004 (compiled by ORIMA Research). Used as facts with attribution; AIP's site states its copyright and a disclaimer.NSW FuelCheck price history (Data.NSW, CC BY-SA). Every price change at every NSW and ACT servo, published monthly. This site replays the changes day by day to rebuild a daily average for Sydney, Canberra and regional NSW, and monthly averages by suburb and brand. Figures derived from it are shared under the same licence.Excise. Rates and dates from the Department of Infrastructure's fact sheets of 1 April and 1 July 2026 and from ABC News reports citing the ATO (the ATO site does not answer automated requests).

Calculations

Medians, not means, for live WA prices, so one remote roadhouse does not drag a region. A live price more than 30 cents under its region's median is left out of rankings (usually a site that has run out and kept an old price). Margin = weekly retail average minus the average terminal gate price of the same seven days. Price cycle = each weekday's gap to the centred seven-day mean, averaged over twelve months; a restoration is a rise of at least 6 c (Perth) or 8 c (Sydney) within three days.

What is not here yet

Live station prices for NSW, the ACT, Tasmania, Queensland, South Australia and Victoria need a free key or a data-user registration with each scheme. Until those are in place, those states are covered by weekly averages, the terminal gate price and, for NSW and the ACT, the monthly station history.