SA Fuel Prices – Week of 31 August 2026

South Australia is the cheapest state in the country for petrol right now, with metro U91 sitting at 202.9 c/L, a full 1.9c below the national metro average of 204.8 c/L. That's genuinely good news for SA drivers, even if prices are drifting upward as the week closes out.

SA Fuel Price Snapshot: 31 August to 7 September 2026

SA Petrol Prices Mid-Week: The Dip and the Drift

U91 metro prices started the week quietly, easing from 202.2 c/L on Monday down to a low of 201.9 c/L on Wednesday. Then the climb began. By Friday and Saturday, metro U91 had risen to 204.4 c/L, a move of about 2.5 cents in just three days.

Rural prices followed a similar pattern, holding steady at 214.5 c/L for the first three days before nudging up to 215.3 c/L by Friday. The 11.9c gap between metro and rural means regional drivers are paying roughly an extra $7 on a 60-litre fill compared to their Adelaide counterparts. That adds up fast over a month.

Diesel is the notable mover this week, up 0.8c in metro areas to 250.1 c/L. The premium over metro U91 sits at 47.2c, which is significant. If you're driving a diesel vehicle, that's a meaningful cost difference to keep an eye on week to week.

Cheapest Fuel Brands and Stations in SA This Week

The spread between SA's cheapest and priciest metro stations tells a striking story. Costco Kilburn was flagged as low as 188.7 c/L, while BP Kangarilla reached 214.9 c/L. That's a 26.2c gap between the two extremes. On a 60-litre tank, choosing wisely could save you over $15.

Brand averages tell a similar story. U-Go, SOLO, and Mobil all averaged 196.3 c/L for metro U91, while BP averaged 207.3 c/L and On the Run came in at 205.2 c/L. The gap between cheapest and priciest brands is more than 11 cents, so brand loyalty can cost you.

Last Wednesday, 2 September, was the cheapest day to fill up last week, with metro U91 touching 201.9 c/L. If you missed it, you weren't alone, but it's a useful reminder that mid-week often offers better value than the weekend.

SA Metro Petrol Price Forecast: Next Three Days

Metro U91 prices are expected to keep climbing over the coming days. The forecast puts metro U91 at 205.2 c/L on Sunday (78% confidence), rising to 206 c/L on Monday (71% confidence), and 206.6 c/L on Tuesday (65% confidence). That's roughly a 3.7c rise from the current metro average of 202.9 c/L over just three days.

Confidence dips as the forecast extends, but the direction is clear. If you can fill up today rather than early next week, you're likely to pay less.

What SA Drivers Can Do Right Now to Save

The 30-day metro U91 range has run from 187.9 c/L to 219.9 c/L, and the current price of 202.9 c/L sits comfortably in the middle. You're not at a peak, but with prices trending up and the forecast pointing higher, waiting isn't going to reward you this time.

One more thing worth flagging: LPG supply across SA has tightened noticeably, with 47 stations currently out of stock, up from 40 last week. If LPG is your fuel of choice, check availability before you head out.

The simplest move? Use Petrol Smart to find the cheapest station near you before you leave home. Given that metro prices range by more than 26 cents depending on where you stop, a two-minute check can easily save you $10 to $15 per tank.

Download Petrol Smart for live prices on the map, route planning, and price alerts. It's free and has no ads.