Bordertown Diesel Lifts Nearly 10 Cents as South Australia Averages Climb Past 257
Right, so the diesel story in South Australia has flipped on us in about a week, and if you run a ute or a van for work you'll wanna know where the pain is landing.
As of Monday 7th Sep 2026 at 2:03pm, the state average for diesel prices across SA sits at 257.6 cents a litre, up 7.7 cents from 249.9 the day before. That's off 386 stations reporting, so it's not one dodgy servo dragging the number about. It's a genuine lift across the board.
Bordertown cops the biggest jump
The suburb that moved hardest is Bordertown, out on the Dukes Highway near the Victorian line. Diesel there has gone from 241.9 to 251.8 across six servos, a lift of 9.9 cents. Fair dinkum, that's nearly ten cents in a town where you haven't exactly got twenty options to pick from.
Here's the thing, right. Bordertown is a truck town. It's the stop between Adelaide and Melbourne where everyone tops up, and a ten cent move on an 80 litre tank is about eight bucks. Do that twice a week and there's the price of a counter meal gone every fortnight.
What gets me is that Bordertown sits maybe half an hour from the Victorian border, and Victoria is averaging 255.0 for diesel. The state next door is cheaper on average than the SA town closest to it. If you're out that way with the range to spare, have a squiz at what the Victorian side is doing before you commit.
Port Augusta going the other way
While Bordertown lifted, Port Augusta has kept easing. Diesel up there is now 247.2 across ten stations, down 8.7 cents from 255.9.
I wrote about Port Augusta a few days back when it was sitting around 242, so it's crept up a touch since. Even so, it's more than ten cents under the state average and better than four cents under Bordertown. That's the wrong way round on freight distance alone. Port Augusta is a fair way further from the refineries and the port, and it's still beating a town sitting on the main freight corridor.
Local competition counts for more than how far the truck has driven. Usually does.
What the rest of the state looks like
SA is now the priciest mainland state for diesel outside the Northern Territory. Victoria is on 255.0, NSW 255.4, Tasmania 255.6, Queensland 256.2, Western Australia 257.1, and South Australia 257.6.
So that's a couple of cents between most of the mainland, which tells you this isn't an SA specific problem. Wholesale has moved and everyone is copping it. Which servo you roll into matters a lot more this week than which state you're standing in.
The spread within SA proves it. Strip out the rubbish readings at either end and there's still twenty plus cents between the sharpest sites and the ones taking the mick. Mount Gambier has been decent value on premium for a while and the Riverland towns have held up reasonably well too.
What I'd do
If you're in Bordertown and you're not running on fumes, hold off a couple of days. Ten cent jumps in small towns tend to be servos following each other up rather than a permanent shift, and they usually settle back a few cents once one of them blinks.
If you're doing the Adelaide to Melbourne haul, fill on the Victorian side where you can. The averages say you're in front, and on a big tank that's your coffee paid for and then some.
Petrol drivers want to watch unleaded petrol prices on their own. Diesel and unleaded don't always move together, and this week they've been doing their own thing entirely.
Worth checking the price trends before you head out, because the numbers shift twice a day and what was cheap Friday arvo might not be cheap Monday morning. Or sort your nearest servos on the interactive fuel map and see it laid out.
Look, end of the day, a bit of planning means more cash in your pocket for the important stuff. Can't argue with that.
