TL;DR: If your handbook says 95 is recommended, 91 won’t wreck it. In Brisbane, 95 runs about 15c a litre over 91 — near enough to $9 a tank, $180 a year. If your handbook says 95 required, that’s a different answer: pay the gap. Two words in your book settle it.
Two words do all the work here, and they’re both in your handbook: recommended and required. Worth finding out which one is yours before you spend another cent.
The question
I get asked this over the op-shop counter most weeks. Someone’s staring at the 95 button, staring at the price, doing the sum in their head. The handbook says 95. The 91’s right there, cheaper. Is saving the money going to cost them an engine?
Fair question. Nobody wants a repair bill to save a few bob at the bowser.
The claim
“My handbook says 95, so I have to buy 95, and it’s costing me a fortune.”
What I checked
Every number here is the Queensland Government price feed — the actual price each station reported charging, not a driver’s guess at the bowser. Same feed that fills the map.
I pulled the Brisbane-metro prices: 473 stations sit within 30 km of the CBD, and about 440 of them report a 91 price on any given day, about 317 a 95 price. Then, for each station that sells both, I measured the gap between the grades at that same pump on that same day, and took the median across every station and every day.
Doing it pump-by-pump matters. 95 tends to be sold at a slightly different, on-average-cheaper set of stations, so comparing citywide averages would flatter the gap. Same-day, same-station is the gap a real driver actually faces at the nozzle.
I ran it two ways — across the full 18 months (15 Jan 2025 to 18 Jul 2026), and across just the last 2.5 months — so a short-term wobble couldn’t masquerade as the norm. There’s a known data gap from early March to late April where reports went quiet; I’ve cut it out entirely, because carrying the last price forward across it would invent a fake ramp.
What it shows
The gap between grades, measured pump-by-pump:
- 95 over 91: about 15c a litre on the 18-month average — and it’s been widening, running closer to 17c these last couple of months.
- 98 over 91: about 23c a litre on the 18-month average, and drifting up — closer to 26c right now. Call it about 25c if you’re filling today.
- 98 over 95: about 8c a litre (nearer 9c right now).
Those gaps hold steady through the cycle, because 91, 95 and 98 all rise and fall together — when 91 jumps 30c overnight, so do the others. That’s why the gap is the honest number to quote, not the price on any one day.
Put it in tank-and-year terms, because that’s the sum that actually matters. I’ll use the 18-month average and label it — scale it to your own driving:
- 95 costs about $9.00 more per 60L tank — roughly $180 a year (1,200L, or about 20,000 km at 6L/100km).
- 98 costs about $13.80 more per tank — roughly $276 a year over 91.
Right now, on the wider mid-2026 gaps, both are a touch dearer: about $10.20 a tank / $204 a year for 95, and about $15.60 a tank / $312 a year for 98. Every 1c of gap is 60c a tank and $12 a year, so you can do your own.
The verdict
Here’s the bit that answers “will it wreck my car”:
- Handbook says 95 recommended — 91 is generally fine on a modern car. The engine’s knock sensor quietly pulls the timing back a touch: slightly less pull, slightly worse economy, no damage. You keep the 15c.
- Handbook says 95 required or minimum 95 — or the car’s turbo, high-compression, a performance or premium-only engine — use at least 95. Here the gap is buying you the right fuel, not a luxury. Don’t go below.
I’m not a mechanic, and this isn’t advice about your particular engine — your owner’s handbook is the authority on that, and the recommended-versus-required line in it is the whole answer. Check your book. Mine — a little Mazda2 — says recommended, and I run 91 in it without a second thought.
So what for you
If yours says recommended and you’ve been paying for 95 out of habit, that habit’s costing you around $180 a year. Switch to 91 and pocket it.
One honest catch: a car tuned for 95 can lose a few percent on economy running 91, which nibbles at the saving. But a few percent on economy is a smaller number than the roughly 9% you pay for 95 — so 91 still comes out cheaper per kilometre when it’s only recommended. (And if your car’s an E10-only or premium-only model, the handbook will say so — that trumps everything here.)
Either way, you still want the cheapest 91 — or 95 — near you, not just any servo with your grade on the board. That’s what Pinly Fuel is for: the prices come straight off the Queensland Government feed, so the number on the map is the number at the pump.
The honest limit
These are Brisbane-metro gaps — QLD, petrol, within 30 km of the CBD. Your local servo’s spread can differ, not every station stocks all three grades, and 95 is sold at fewer of them (about 317 report a price daily), so that figure carries a touch less certainty than 91. The gaps are drifting up in 2026 — 95 is 15c on the 18-month average and closer to 17c right now, 98 is 23c averaging out and nearer 26c today — so I’ve labelled which is which rather than pretend one frozen number lasts forever. The dollar figures assume a 60L tank and 1,200L a year; scale them to your own driving — every 1c of gap is about 60c a tank and $12 a year. And none of this is mechanical advice: your handbook, not me.