WA Fuel Prices – Week of 18 May 2026

Diesel drivers in WA got some welcome relief this week, while petrol users felt the squeeze. Metro U91 climbed 3.3c to land at 181.3 c/L, but diesel dropped a solid 5.4c to 216.8 c/L — one of the bigger single-week falls we've seen across fuel types recently.

WA Petrol and Diesel Prices: 18–25 May 2026

Biggest Movers in WA Fuel Prices This Week

Diesel was the standout story. Both metro and rural prices fell by exactly 5.4c, bringing metro diesel to 216.8 c/L and rural to 236.9 c/L. That's meaningful savings for tradies, fleet operators, and anyone driving a diesel vehicle regularly.

Metro U91 had a rougher week. Prices surged through the middle of the week, peaking at 185.5c on Wednesday before easing back. By Sunday the daily reading had settled at 181.2c, suggesting the spike was short-lived rather than the start of a new trend.

P95 followed a near-identical pattern, jumping to 201.3c metro on Wednesday before pulling back to 196.3c by the end of the week. If you filled up mid-week, you paid more than you needed to.

P98 moved in lockstep, hitting 210.2c metro on Wednesday and sliding to 205.5c by Sunday. Rural P98 was much steadier, barely moving across the week.

LPG barely budged in metro, holding almost flat at 152.1 c/L all week. Rural LPG had a dramatic fall of 10.1c, though that's based on just 5 rural stations, so read it with some caution.

WA Metro Price Range: How Much You Can Save by Shopping Around

The spread between the cheapest and most expensive metro stations this week was genuinely eye-opening. Burk Burk Oakford was the cheapest metro station at 159.3 c/L, while Independent Hills Emporio topped out at 216.9 c/L — a gap of 57.6c per litre. On a 60-litre tank, that's a $34 difference depending purely on where you stop.

Brand averages tell a similar story. Burk averaged 170.9c across its 9 metro stations, Liberty came in at 172.4c, and United at 173.6c. At the other end, Independent averaged 197.6c across 6 stations — nearly 27c more per litre than Burk. That gap is far too wide to ignore.

Which Day Was Cheapest to Fill Up Last Week in WA

Last Monday (18 May) was the cheapest day of the week to fill up, with metro U91 sitting at 175.3 c/L. Prices climbed sharply through Tuesday and Wednesday before settling back down. Timing your visit to early in the week would have saved a noticeable amount compared to a mid-week stop.

WA Metro Petrol Price Forecast: Next 3 Days

Metro U91 is currently at 181.3 c/L and the forecast suggests gradual increases ahead. Prices are tipped to ease slightly to 180.9c on Sunday (78% confidence), then tick up to 182.3c Monday and 183.7c Tuesday. Nothing dramatic, but the trend points upward.

WA is currently tracking 2.5c below the national metro U91 average of 183.8 c/L, which is a small but genuine advantage compared to drivers in NSW who are paying 187.6c.

How to Save on Fuel in WA This Week

The actionable takeaway is straightforward. Fill up early in the week to avoid the mid-week price surge, stick to cheaper brands like Burk, Liberty, or United, and use Petrol Smart to find the lowest price near your route before you commit to a station. On a full tank, the difference between a smart fill and a lazy fill is easily $20 to $30.

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