Cheapest U91 Fuel Prices in South Australia Today

As of 5 July 2026, the cheapest U91 in South Australia is 153.70 cents per litre in Kilburn. The state average is 170.60 c/L across 317 stations. Prices update every 15 minutes from official government data.

FuelTrack tracks prices at 317 petrol stations across 115 suburbs in South Australia. Prices are sourced from official government fuel price monitoring schemes and updated every 15 minutes.

Based on the past 4 weeks, Mondays tend to have the cheapest U91 prices in South Australia, averaging 153.50 c/L. Fridays tend to be the most expensive at 157.80 c/L – a difference of 4.3 cents. Patterns vary by suburb, so check your local area for the most accurate timing.

Fuel excise is the federal tax built into the price of every litre of petrol and diesel. It normally rises twice a year in line with inflation, and in early 2026 it sat at 52.6 cents a litre. When conflict in the Middle East pushed oil prices higher, the government brought in cost-of-living relief: from 1 April it roughly halved the excise, taking about 32 cents a litre off the bowser price. On 20 June that relief was extended into July but tapered to a 16 cent cut, lifting the excise to 36.6 cents, so pump prices rose at the start of July. The reduced rate runs until 2 August. From 3 August the full 52.6 cent excise returns, and because GST is charged on top of it, that's expected to add about 18 cents a litre at the pump, or roughly $9 on a 50-litre tank, unless retailers absorb part of the increase. A routine inflation adjustment in early August nudges the rate a little higher again.