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When do fuel stations change their prices in Victoria?

Price changes over 90 days at 1 672 stations in Victoria, measured one station at a time: which weekday, how often, by how much, and which network moves first. These are not today’s prices — this is the rhythm behind them.

Window: Jun 26, 2026 – Sep 23, 2026 · 90 days · rebuilt every night

• A station in Victoria changes its Unleaded 91 price 5.08 times a week on average, and a price that has just changed then holds for 1 day before the next one.
• On an ordinary day 91.8% of the stations in Victoria change their price; on the busiest day of the window, 99.9%.
• The busiest weekday is Tuesday, with 19.5% of all changes; the quietest is Sunday, with 5.3%.
• An increase moves the price by 0.021 AUD/L on average, a cut by 0.020 AUD/L. Over the window there were 40 085 changes upward and 22 978 downward.
• Half of all the price changes of the last 52 days happened on just 20 of them.
• When EG Ampol moves, 100% of its own stations move on the same day — the price of a station in this network is not set at the station.
• Reddy Express reaches the centre of a market-wide move first in 6 of the 6 waves we measured; the rest follow at a median of 0.3 days.
• Across the window the market median went from 1.221 AUD/L to 1.463 AUD/L.
• Where the source carries a clock of its own, most changes land between 06:00 and 07:00 — 67% of 1 640 changes carrying a timestamp in the sample.

Which weekday

Each bar is the number of price changes we recorded on that weekday over the whole window, split by direction. The dashed line is what a week with no pattern would look like: one seventh of the changes on each day.

Ninety days, day by day

Top: the share of stations that changed price that day, above the line for increases, below it for cuts. Bottom: the median price across the market, the same days. The two panels share the same dates — read them as one picture, not as two scales on one axis.

How big is one change

The distribution of the size of a single change at a single station, increases on one side and cuts on the other. The marked line on each arm is the median. “Rocket and feather” asks whether the two arms are the same shape — here they are not.

The hour of the day

Here it can: the source carries a clock of its own. 1 640 changes with a timestamp from the last 7 days, one bar per hour, as a share of them all.

Network by network

Only networks with at least 20 stations in the window. “Together” is the share of a network’s own stations that change on a day when that network moves at all; “Behind” is how many days later that network reaches the centre of a market-wide move, compared with the first network to move.

How this was measured

• One price per station per day. The daily history table holds one row per station, fuel and day. A row is also written back to the date the source itself gives as the moment of the change, so a change lands on the day the operator made it, not on the day we happened to read it.
• A change is two consecutive days in a station’s series with different prices; it is counted on the second of the two. If more than 3 days separate the two readings, the pair is dropped — there is no way to say which day the price moved.
• A market-wide move — a “wave” — is a run of days on which at least 96% of the stations with a price changed it; the threshold is not a fixed number but the market’s own median plus half the way to its 95th percentile. Within a wave each network gets the centre of gravity of its own changes; the network whose centre falls earliest moved first. Waves found in this window: 6.
• Prices of zero or below are dropped before anything is computed. Everything on this page is about Unleaded 91 and Diesel; other fuels are not mixed in.
• The figures are rebuilt once a night from the full history, not on every visit.

What this cannot tell you

• At most one change per station per day is visible, because the history keeps one price per station per day. Where we read more often — Romania, every two hours — 10.7% of the station-days that carried a change carried more than one, so a once-a-day measurement undercounts by roughly that much.
• The window contains a real price trend, so the count of increases and cuts is not a fair contest: over these 90 days the market median went from 1.221 AUD/L to 1.463 AUD/L. The size of a single step is the fairer comparison, and it is reported separately.
• Networks are read from the station register, so a station whose network is not recorded there falls outside the network table, even though its changes are still counted everywhere else.
• The window covers 1 672 stations with a usable series out of the ones we track; a station that entered or left the register mid-window contributes only the days it was there.

Questions

Does this tell me the best day to fill up?

It tells you when the market moves, not which way it will move. In Victoria the busiest day is Tuesday (19.5% of all changes) and the quietest is Sunday (5.3%). A day with few changes is a day on which yesterday’s price is still standing — useful if yesterday was cheap, useless if it was not.

Do you know the hour at which a price changes?

For Victoria, yes: the source carries a clock of its own, and most changes land between 06:00 and 07:00. Where a source does not carry one, this site writes “the hour cannot be established” instead of guessing, and that is the honest answer for every market whose history keeps one price per day.

How do you know a price changed at all?

By comparing a station with itself. Two consecutive days in the same station’s series with two different prices is one change, counted on the second day. Over 90 days that gives 63 063 changes at 1 672 stations, and every figure above is a slice of that same set.