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Perth Petrol Prices: Can Filling Up on Tuesday Instead of Wednesday Save You $1,000?

FuelWatch’s current guidance describes a Wednesday rise in Perth and Mandurah ULP prices, followed by six days of declines. It does not establish a guaranteed $1,000 saving from choosing Tuesday over Wednesday.
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No—not on the evidence available. FuelWatch’s current guidance says Perth and Mandurah’s regular unleaded petrol (ULP) cycle rises sharply on Wednesday, then falls over the following six days. That does not establish that Tuesday is always more expensive than Wednesday, or that changing your fill-up day would save $1,000. Check FuelWatch for your suburb, fuel grade and the date you plan to buy.

What FuelWatch says about Perth’s petrol price cycle

FuelWatch describes a current weekly cycle for ULP in Perth and Mandurah: prices rise sharply on Wednesday and then decline over the next six days. The cycle description applies to unleaded petrol, not diesel or LPG. Regional WA generally does not follow the same cycle. FuelWatch and fuel prices

That guidance is not a promise that every station will be cheaper on Tuesday than Wednesday. The price you can buy at depends on the station and date, so a weekday rule is no substitute for checking the actual listing.

Older advice can be misleading if presented as current. A WA Consumer Protection blog from around 2019 described Monday as generally the cheapest day and Tuesday as the most expensive in the Perth cycle. That historical description does not override FuelWatch’s current guidance. Commissioner’s Blog: Use FuelWatch to find best deal

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Does switching from Tuesday to Wednesday save $1,000?

The official examples support possible savings of dollars per fill, not a universal $1,000 annual saving from choosing Tuesday instead of Wednesday. FuelWatch says motorists could save up to 30 cents per litre on a given day, equivalent to $18 on a 60-litre tank. That is an illustrative maximum, not a guaranteed saving or a Tuesday-versus-Wednesday comparison. How FuelWatch works

A WA Consumer Protection announcement published on 6 October 2026 gave a separate dated example: Perth’s average ULP price was set to rise by 14.2 cents per litre from 6am on Wednesday 7 October to 244.3 cents per litre. It also said a 43-cent-per-litre difference between the cheapest and most expensive sites could mean a potential $25 saving on a 60-litre tank. Those figures concern a particular date and a comparison between stations; they do not establish a recurring Tuesday-to-Wednesday saving. WA Consumer Protection’s 6 October 2026 announcement

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The arithmetic for a particular fill is straightforward:

Saving in dollars = price difference in cents per litre × litres bought ÷ 100.

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For example, a 10-cent-per-litre difference on a 60-litre fill would be $6, if both prices apply to the fuel and purchase being compared. To turn a per-fill difference into an annual figure, you would also need to state how many times you fill up and show that the same difference actually applied each time. The official examples above do not supply that evidence for a $1,000 yearly saving.

How to check tomorrow’s prices on FuelWatch

  1. Search your suburb or postcode, or use the location feature. FuelWatch lists prices for WA fuel retailers and lets you compare nearby stations. FuelWatch and fuel prices
  2. Choose the fuel grade you need. Do not apply the ULP cycle description to diesel or LPG.
  3. Check both today’s and tomorrow’s listings. Retailers notify next-day prices by 2pm, and FuelWatch publishes them from 2:30pm.
  4. Confirm when the listed price applies. The notified price takes effect at 6am and is locked for 24 hours.
  5. Compare the final cost, not just the displayed cents per litre. FuelWatch shows standard cash prices; its listings exclude discounts and charges such as supermarket fuel discounts and credit-card fees. Check which discounts you can actually use and whether a payment fee applies. How FuelWatch works
  6. Account for the drive to the station. A lower listed price farther away may not be worthwhile once you consider the extra distance. Compare the likely fuel saving with the cost and time of the detour.
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What to include in a meaningful savings comparison

For a fair Tuesday-versus-Wednesday calculation, compare the same fuel grade and the actual prices available to you on the relevant dates. Record the per-litre difference, how many litres you plan to buy, any discount or payment fee, and whether one station requires a detour. FuelWatch’s free service is available through its website, personalised email service and phone line. How FuelWatch works

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Use the result for that purchase as a per-fill estimate. An annual total depends on your own number of fill-ups and the price differences on those occasions; the available official examples do not establish a typical yearly saving of $1,000.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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